如图,木块竖立在小车上,随小车一起以相同的速度向右作匀速直线运动.下列分析正确的

题型:选择题

问题:

如图,木块竖立在小车上,随小车一起以相同的速度向右作匀速直线运动.下列分析正确的是(  )

A.木块没有受到小车的摩擦力

B.木块运动速度越大,惯性也越大

C.木块对小车的压力与小车对木块的支持力是一对平衡力

D.当小车受到阻力突然停止运动时,如果木块与小车接触面光滑,木块将向右倾倒

考点:惯性现象
题型:选择题

为使火灾自动报警系统或系统内各组成部分恢复到正常监视状态进行的操作是()。

(A)联动

(B)自检

(C)警报器消音

(D)复位

题型:选择题

语法填空。

     阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用

括号中词语的正确形式填空,并将答案填写在标号为1-10的相应位置上。

     This is a true story which happened in the States. A man came out of his home to admire his new truck.

To his 1______ (puzzle), his three-year-old son was 2______ (happy) hammering dents (凹痕) into the shiny

paint of the truck. The man ran to his son, knocked him away, hammered the little boy's hands into pulp (果

浆汁) as 3______ (punish). When the father calmed down, he rushed his son to the hospital.

     4______ the doctor tried desperately to save the crushed bones, he finally had to cut the fingers from both

the boy's hands. When the boy 5______ (wake)up from the operation and saw his bandaged stubs, he

innocently said, "Daddy, I'm sorry about your truck." Then he asked, "6______ when are my fingers going to

grow back?"

     The father went home and committed suicide.

     Think about this story 7______ next times someone steps on your feet or you wish to take revenge. Think

first 8______ you lose your patience with someone you love. Trucks can 9______ (repair). Broken bones and

hurt feelings often can't. Too often we fail to recognize the difference between the person and the performance.

We forget that forgiveness is 10______ (great) than revenge.

     People make mistakes. We are allowed to make mistakes. But the actions we take while in a rage will

impress us forever.

题型:选择题

尿布皮炎的发生与以下哪种物质有关()

A.尿酸

B.氨

C.无机盐

D.微生物感染

题型:选择题

液压支架安全阀定期抽查试验,开启压力不小于()pH(额定工作压力)。

A、0、7

B、0、8

C、0、9

题型:选择题

降压变电所全部停电时,应将各个可能来电侧的部分接地短路,其余部分不必每段都装()。

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