[单选题]UMS are mainly unattended overnight and during this time ____ should have control of the main engine

正确答案 ：C

the bridge officer on watch

[单选题]下列关于热的传播形式说法错误的是：_______。

正确答案 ：D

热的三种传播形式都受介质影响，都易造成火势蔓延。

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