单体支柱工作面煤壁附近预防局部冒顶的措施有哪些？

阅读理解。

    Three rich ladies met every day by the river. They sat there and talked the whole day. Once the three

ladies quarreled. One of them said, "Look, how white and beautiful my hands are!" Another one said, "My

hands are more beautiful." The third one said, "Mine are the most beautiful ones." An old beggar woman

came to them. "Beautiful ladies," she said, "I'm old and can't work. I'm hungry. Please give me something

to eat."

     But the three women gave her nothing. They only asked, "Tell me, old woman, who of us has the most

beautiful hands?"

     A peasant woman (农妇) was also sitting by the river. She was poor and her hands were rough because

of hard work. The old woman came up to her and said, "I'm hungry. Please give me something to eat." The

peasant woman took out her only cake she had and gave her half.

     The old woman ate it and drank some water. Then she took the peasant woman by the hand, brought her

before the rich ladies and said, "Now, I shall tell you whose hands are the most beautiful. The hands of the

poor peasant woman are rough because of work, but they give us food; they are far more beautiful than your

hands which have never done anything."

根据短文内容，判断下列句子正误。正确的用“A”表示，不正确的用“B”表示。

( )1. The three ladies had a quarrel every day.

( )2. The old woman asked for something to eat, but nobody gave anything to her.

( )3. The peasant woman's hands were not as white as the three ladies because of the hard work she had

            done.

( )4. The old woman said that the peasant woman's hands were more beautiful than the three ladies'

            because she liked dark hands better than white hands.

( )5. The three ladies were rich but unkind.

请用所学的生物学知识解释下列生活中的现象：课间休息时，同学们在教室玩耍，小刚的手不小心被钉子扎了一下，立即缩回，这属于______反射，说明脊髓具有______功能；这时，突然听到有人喊了一声“老师来了!”教室里马上安静了下来，这属于______反射，该反射的神经中枢位于______．

同车道行驶的机动车，在哪些情况下不能超车？

关于设备到场验收检查，以下说法正确的是 (54) 。

A．设备到货时，只需承建方和监理方到现场进行检查

B．设备到货开箱检查可以在承建方库房进行

C．监理方必须对所有设备进行开箱检验

D．在大批量同规格设备到货时，监理方可进行抽查

下列关于合流制排水系统的水量和水质特点的叙述错误的是______。

A．合流制排水管道中在晴天时只有城市污水，雨天时为雨污混合水
B．全部处理式合流制能有效地控制雨污水的排放，有利于水体保护，但污水处理厂规模大，工程投资大
C．从合流制截流干管溢流井溢出的雨污混合污水就近排入水体，对水体的污染也是很严重的
D．雨天时，截流干管送往污水处理厂的混合污水，因有雨水的稀释，水质可能比旱流污水好，对污水处理厂的运行管理是有利的