Rename the issue! Hurry, hurry

Simple. Set it up first: My Computer - Tools - Folder Options - View - Hide Extensions of Known File Types - Apply - OK.

After setting up, please change the file name casually There will be no unusable phenomenon.

Renaming the file will not make the file unusable, unless your file name shows a suffix, and if you change the suffix, the computer will not recognize the file type, so it will not be able to open.

In other words, be careful not to change the suffix when changing the sentence.

If it has been changed, then change it again, add the suffix of the file name, for example, after changing the name to 2222, the computer cannot be opened, then change it again.

In addition, if you often perform such operations, it is recommended to hide the file suffix

Open "My Computer", click "Tools", "Folder Options", and click "Hide extensions of known file types" in the "View" tab to OK.

..You've got the file extension.

On my computer, click Tools - Folder Options - View known file types and turn them off on it.

For example:**. jpg

You can change the word **, but the latter one. jpg can't be changed.

Faint to death, don't change your suffix, it's (..)txt .exe)

You can hide the extension of known folders in the My Files tab - View.

Each file will have a file type, which is usually distinguished by a suffix, such as yes. txt file,exe file, etc., if you want to modify the file name of the file, don't modify it with the suffix, for example, if you want to modify it, you only need to modify 1.

If you change the suffix, it will not be available. If you are linked to a shortcut, etc., the shortcut will not be available after changing the file name.

Probably you put the file extension (that is, the file name of ".).The last few letters) have been deleted. Note that when you change the file name in the future, just don't move the dot after it. For example:**. txt .doc .exe .ppt and so on).

What do you want to change the ** file? Is it with a suffix (.).*If it is, just change the front one, and don't move the back one.

You changed the computer extension.

When the name was changed, that. Don't move the one behind (dot).

Change the previous one.

You don't want to change the extension of the file, which is the one behind the file. txt .exe .rar

Don't change those words, just change the words in front of you.

Your problem is actually to change the suffix of the file, which is after the name. xx Let's say I have a file with a WordPad and its name is""Then when you change your name, don't change it. txt only changes the previous one"123"That's it, but it's more troublesome, and there's a one-time solution to the problem, which is that you open my computer (or any folder on the desktop) first, and there's a blue bar on it and a blue bar below"File view.

And so on tools, you click"tools"Then select the folder option, a box appears and then click on the second"Check"There's a lot of content below, and there's an option you'll find in it"Hides extensions for known file types"In front of him is a box, click on the box, a small check mark appears, and then OK, and that's it.

Two or more people are called by the same name. We can all tell. But computers can't.

Computers are high-level fools. He only recognizes names. And you can only recognize one, so you can't have more than two names, and the name behind the dot is what type of file it is.

That 111 is his name, and you can change it as long as the name doesn't duplicate the one in the current folder. But the software can't be left alone. Because those files are all interrelated.

The question you are asking falls under the category of nomenclature of organic chemical sugars.

The chain structure of monosaccharides is often expressed by the fischer projection. The following is illustrated with the example of d-(+glucose).

d-(+ Fischer projection of glucose.

When expressed in the Fischer projection, it is stipulated that the carbonyl group in the sugar must be at the upper end of the projection, and the number of the carbon atom starts from the end close to the carbonyl group. As in Eq. (i) above; For the convenience of writing, hydrogen on chiral carbons can also be omitted, as in Eq. (ii); A more convenient approach is to omit the hydroxyl group, hydrogen and carbon-hydrogen bonds that swim on chiral carbons, as in Eq. (iii).

If the aldehyde group in (iii) is denoted by , and the hydroxymethyl group is denoted by , then equation (iv) is obtained, which is the simplest way to write it. Of the four representations described above, equation (iii) is the most widely used.

Monosaccharides can be divided into D-type series and L-type series. The division of the two series is based on glyceric

aldehyde) is used as a criterion for comparison and is determined by the configuration of the lowest asymmetric carbon atom in the Fischer projection. If the configuration of this chiral carbon atom is the same as that of D-glyceraldehyde, it belongs to the D series. If it has the same structure as L-glyceraldehyde, it belongs to the L series.

For example, monosaccharides can be named according to systematic nomenclature, but because there are often multiple chiral carbon atoms in monosaccharide molecules, there are many stereoisomers, and for convenience, it is generally named after its **. The direction of the rotation of sugar is determined experimentally, with the right rotation being "+" and the left rotation being " "For example:

QQ (or other software) automatically modifies the name of the file with security risks, adding ". . " to the end of the original filerename" to prevent users from accidentally clicking to run dangerous programs and causing computer viruses. In this regard, you only need to confirm the security of the documents by following the steps below, and then you can use them in the wildstove:

1) Confirm the security of the file.

Before changing the file name, it is recommended that you scan the file with a professional antivirus software (make sure that the virus database of the antivirus software is the latest version). After confirming the security of the file, proceed to the next step;

2) Change the file name.

Use the right mouse button to click on the file, and select the "Rename" item in the pop-up menu to make the file name stateable, at this time, you can remove the ". . " in the file nameRename" character.

3) Run the program.

Now you can click on the program to run them.

Note: It is best not to send the self-extracting file as a file, otherwise it will cause this decompression to not be able to start!

The alkyne is named, and the carbon chain with the most unsaturated bonds is selected as the main chain.

And make the unsaturated bond position minimum, when selective, give priority to make the double bond position the minimum.

So the numbering starts from the far right.

3,4-Dipropyl-1,3-hexadiene-5-yne.

It is the NBS bromination reagent, and the following names of N-bromosuccinimide can be used, and the first one is common.

N-Bromosuccinimide.

1-bromo-2,5-pyrrolodione.