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【单选题】
将1500 kg·h -1 , 80°C的硝基苯通过换热器冷却到40°C,冷却水初30°C,出口温度不超过35°C,硝基苯比热为1.38kJ·kg -1 ·K -1 ,则换热器的热负荷为( )。
A.
19800kJ·h -1
B.
82800kJ·h -1
C.
82800kw
D.
19800kw
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【单选题】用透光法检测小平面时,如果刀口形直尺中间透光明显,则说明工件:
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【单选题】The number of the cranes is getting ________  . If we don't help them, they will disappear ________ a few years. [     ]
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