题目内容

法定计量单位中体积的单位是()。

A. m3
B. dm3
C. cm3
D. mm3

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正常工作的冷凝器热交换过程为()。

冷凝器内若有大量的不凝性气体,则冷凝温度()。

The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?()

Any one component can be eliminated to extinguish a fire
B. Any two components must be eliminated to properly extinguish a fire
C. Any three components must be eliminated to properly extinguish a fire
D. Ali four components must be eliminated to extinguish any fire

钢材含碳量越高,强度越高,塑性与韧性(),可焊性越差。

A. 上升
B. 下降
C. 保持不变
D. 可能下降

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