题目内容

车辆进入环岛路口应（）行驶。

A. 逆时针方向
B. 顺时针方向
C. 逆时针方向、顺时针方向

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互换的特点

The（）is that search and rescue authorities ashore, as well as shipping in the immediate vicinity of the ship in distress, will be rapidly alerted to a distress incident so they can assist in a coordinated SAR operation with the minimun delay.

A. common communication system
B. distress traffic system
C. basic concept of GMDSS
D. SAR operation procedure

简述壮侗语族分布的特点。

接触线接头线夹起始滑动荷重不低于（）kN。

A. 10
B. 20
C. 30
D. 40