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单选题
可在真空中传热的方式是（）。
A
热传热
B
热对流
C
热辐射
D
B＋C
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Ⅰ，Ⅲ，ⅣC
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单选题The motor for the fresh water pump （）.A
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need to be repairedC
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vacuum pressureB
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inertialD
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The messroomC
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磨损量B
搭口间隙C
平面间隙D
磨损率
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