题目内容

安装后的门窗必须有可靠的（）

A. 牢固性
B. 刚性
C. 美观性
D. 实用性

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Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）

A. Distress messages should first be transmitted on 2182 kHz
B. Channel 16 (156.8 MHz) may be used for distress messages
C. If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
D. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duratio

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