_________ spanner is this?

【名词&注释】

比例尺(scale)

[单选题]_________ spanner is this?

A. What
B. How
C. Whose
D. Who

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学习资料：

[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?

A. Make an entry in the official logbook
B. Open the master control valves on the fixed CO2 system
C. Start the fire pump and check discharge pressure
D. Secure auxiliary condenser overboard discharge

[单选题]A two stroke diesel engine exhaust temperature will be lower than a four stroke diesel engine of the same displacement because the _____. ① MEP is lower and the scavenging air is cooling the exhaust gases ② valve overlap in a four stroke

A. ①
B. ②
C. ① and ②
D. Neither ① nor ② is correct

[单选题]某海图的比例尺为1：250，000，则图上0．2mm的长度相当于实际长度：()

A. 25m
B. 50mm
C. 50m
D. 75m

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