起重机械安全正常工作的条件包括( )。 A．连续调整起重量 B

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问题多项选择题

起重机械安全正常工作的条件包括( )。

A．连续调整起重量

B．整机必须具有必要的抗倾覆稳定性

C．暴露的、活动的零部件装设防护装置

D．金属结构和机械零部件应具有足够的强度、刚性和抗屈曲能力

E．原动机具有满足作业性能要求的功率，制动装置提供必需的制动力矩

答案

参考答案：B,D,E

阅读理解

阅读下面短文判断句子对(√)错(×)。

Do you like snow? I think you will say " Yes ". In winter, the weather is very cold. Many children like to

play with snow. Some of them make snowmen. They're very happy. Where does the snow come from? It

comes from little water drops. When the temperature falls below (在……以下) 0℃, the little water drops

become snow. They're white and clean, like small flowers. They make the world more beautiful.

( ) 1. The weather is very hot in winter.

( ) 2. Many children like to play with snow.

( ) 3. We can't make snowmen when it snows.

( ) 4. The snow comes from litter water drops.

( ) 5. When the temperature falls below 0℃, it begins to snow.

问答题

如何培养学生的创造性人格