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Solution: Let the time of debris flow reach the bottom of the slope t1 and the rate is v1, then.

s1 v0t1 1 5 a1t1 , v1 v0 a1t1 is substituted into v0=8m s, s1=240m, a1=, t1 20 s, v1 16 m s.

Displacement of the car during this time:

The driver's reaction time is 1s, and the displacement of the car in the time of 20-1=19s is:

s2＝1/2 a2 t1²＝ m。

The speed is V2 A2 T2 m s

After the debris flow reaches the bottom of the slope, it moves in a straight line at a uniform speed, and the car has been accelerating, and then the time t3, the debris flow catches up with the car, then there is v1t3 s2 v2t3 1 2 a2 t3

Substituting the value and simplifying it to obtain t 26t3 361 0, because the δ< 0, the equation has no solution, so the debris flow can not catch up with the car, and the driver can get out safely.

Answer: The driver can get out safely.

This is a pursuit problem, considering that when the car and the debris flow speed are the same, the debris flow has not caught up with the car, then the car is safe, take the critical situation, just catch up, the debris flow is more than the car 1s, the displacement in the horizontal plane is the same, the end speed is the same, you can solve.

1) From the condition in the question, aem= mcn=135°, and then the triangle congruence can be determined by sandwiching one side of the two corners;

2) Or use the two corners to prove its congruence, the proof method is the same as (1) Answer: Solution: (1) ae=mc, be=bm, bem= emb=45°, aem=135°, cn bisects dcp, pcn=45°, aem= mcn=135°

In AEM and MCN:

∠aem=∠mcnae=mc∠eam=∠cmn∴△aem≌△mcn，am=mn；

2) Still holds

Intercept ae=mc on the edge ab, connect me, abc is an equilateral triangle, ab=bc, b= acb=60°, acp=120°, ae=mc, be=bm, bem= emb=60°, aem=120°, cn bisect acp, pcn=60°, aem= mcn=120°, cmn=180°- amn- amb=180°- b- amb= bam, aem mcn,am=mn

Full text: Yinshan is snowy, the moon shines on the moon (hanging), () against the west wind, people are slept by Beidou. The heart is drawn and inscribed.

Yin Mountain is snowy, the moon is very different, the camel goes against the west wind, and the person is thin and sleeps. The heart is drawn and inscribed.

Yin Mountain is a foot of snow, thousands of miles of moon disparity, camels go against the west wind, people are (draped) Beidou Mian Ren noon spring first month.

The heart is drawn and inscribed.

The seal is surrounded by the green dragon, the white tiger, the red bird, the Xuanwu, the word in the middle is not clear, guessing that it should be "Pu Ru", because the heart is the word of Pu Ru.

Pu Xinshe (September 2, 1896, 1963) was originally known as Aixin Jueluo Puru, the original word Zhongheng, changed the word Xinshe, and called himself Xihuang Shangren Xishan Yishi. A native of Beijing, Manchu, and the grandson of Prince Yixin of Qinggong. He studied in Germany, and was fond of poetry, calligraphy and painting, all of which were accomplished.

Painting landscapes, good at figures, flowers and calligraphy, and Zhang Daqian has the reputation of "South Zhang Beipu", and Wu Hufan is called "South Wu and North Pu".

However, the seal seems to be imitation, and the seal found on the Internet is as follows, you can compare it.

In fact, no one knows what non-mainstream is.

Head down at a 45-degree angle, then turn the camera up and do a pouting emoji.

Or break down a word into three written Martian texts, or bow your head every day and pretend to be sad.

If a person is ugly, it can be said that he is not mainstream.

If a person has a personality, then he is also very non-mainstream.

For a while, if people say I'm out of the mainstream, I don't even know if they're praising me or scolding me.

I'm not wrong, when you walk down the street and you see a guy with purple hair and nondescript clothes, who walks up and down to make socks and jingles, and you try to persuade him to change his clothes, he will tell you, what, I'm happy, I'm not mainstream.

I'm not criticizing the non-mainstream, and I'm a champion of the non-mainstream.

It's just that in this era, such a non-mainstream has long become the mainstream, but the meaning of the real non-mainstream has disappeared.

We need to support simplicity, which is beauty.