题目内容

螺装时弹簧垫圈应放在()。

A. 垫圈上面
B. 垫圈下面
C. 两螺母之间
D. 螺母上面

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What is the basic concept of GMDSS? ()

A. Search and rescue authorities ashore can be alerted to a distress situation
B. Shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C. Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay
D. All of the above

当你面对航向天线,你的左方应该是()

A. 90Hz调制信号占优势
B. 150Hz调制信号占优势
C. 90Hz+150Hz调制信号占优势
D. 90Hz-150Hz调制信号占优势

什么叫汽机的机械损失?

()对象可以执行【拉长】命令中的【增量】选项。

A. 弧
B. 矩形
C. 圆
D. 圆柱

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