题目内容

PON就是()。

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You are a watch standing mate and have come to the bridge to relieve the watch while underway at sea.The watch should not be transferred().

A. During an engine speed change
B. During a navigational course change
C. Unless the helm is in the“hand”mode
D. All of the above

中国传统文化的基本要素及基本内涵。

红外热像仪使用时应用仪器对所测设备局部扫描后再准确测温()。

A. 正确
B. 错误

采取开阀导流扑救化工企业火灾时,应注意观察设备压力,以防造成()产生回火爆炸。

A. 负压
B. 正压
C. 高压
D. 低压

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