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单选题
All bilge suction must be fitted with suitable （）, which in the machinery space would be mud boxes positioned at floor-plate level for easy access.
A
strainers
B
valves
C
elements
D
separators
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the circuit breakerB
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单选题If an operating bilge pump is developing good vacuum, but is unable to discharge any water, which of the following problems is the most probable cause?（）A
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单选题Storage batteries on T-Boats must be located（）.A
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oneB
twoC
threeD
four
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