[单选题]下列关于心率的定义正确的是( )。
正确答案 :B
每分钟心跳的频率
[单选题]While on watch in the engine room, you hear a continuous sounding of the general alarm. Which of the following actions should you take?
正确答案 :C
Start the fire pump and check discharge pressure
[单选题]利用垫片调整轴承间隙时,要求两侧的垫片数量( )。
正确答案 :A
少并相等
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