题目内容

永磁操动机构结构简单、可靠性高、机械寿命长。（）

查看答案

搜索结果不匹配？点我反馈

更多问题

Under GMDSS, the reserve source of energy is not a battery (for example, a motor generator) the reserve source of energy must be tested at what minimum intervals？

A. Weekly
B. Annually, by a representative of the MSA
C. At the annual SOLAS inspection
D. Monthly

Which of the following is true regarding the definition of the sea areas？

A. It is assured that INMARSAT services are available in sea area A3.
B. It is assured that INMARSAT services are available in sea area A1.
C. It is assured that INMARSAT services are available in sea area A2.
D. It is assured that INMARSAT services are available in sea area A4.

查看答案

绝缘棒使用时，操作人员要戴绝缘手套、穿绝缘靴(鞋)。（）

查看答案

触头间恢复电压是指电弧彻底熄灭后外电路加在触头间的电源电压。（）

查看答案