A.telescopic pipe
B.large bore pipe
C.generating pipe
D.central pipe
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A.flat surface
B.mirror finish
C.sloping surface
D.inclined surface
A.upwards；top
B.upwards；bottom
C.downwards；top
D.downwards；bottom
A.accelerates；decelerates
B.accelerates；accelerates
C.decelerates；decelerates
D.decelerates；accelerates
A.up and down；reciprocating
B.up and down；rotating
C.back and forth；reciprocating
D.back and forth；rotating
A.rotary；reciprocating
B.up and down；fore and aft
C.fore and aft；up and down
D.up and down；rotary
最新試題
The additional mark （）in the Classification Certificate for Machinery means propulsion apparatus is remotely controlled on the navigating bridge control station, and engine assembly control station is unmanned periodically.
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One of the reasons that cause oil flowed from sludge outlet of a self-cleaning separator is（）
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Refrigerant entering the compressor of a refrigeration system should be in which of the following conditions?（）
A purge recovery system is used in a centrifugal air conditioning or refrigeration system to （）
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（） is not installed on the main switchboar.