正确答案: A

two position control

题目：The mode of control employed by an alarm circuit is a

解析：A

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举一反三的答案和解析：

[单选题]在船舶堵漏应急中担任隔离队队长的是：

三副

[单选题]判断船舶是否走锚，下列哪种现象可判断船舶已经走锚。

B．C都是

[单选题]One of the factors limiting the amount of toad which can be put on a modem marine diesel engine is the_______.

exhaust temperature

[单选题]在检验尾轴时，换新铜套应进行0.15MPa的水压试验，______内不得渗漏。

5min