单选
( ) should be defrosted
相关试题
-
I’d like to have a talk _____ your captain.
- A.with
- B.at
- C.on
-
Remote control means that the system is being controlled by the operator whois situated ( ) from the system
- A.automatic
- B.local
- C.remote
-
We use ( ) for the main engin
- A.fuel
- B.gas oil
- C.petrol
-
Head tank should be used to remove ( ) from cooling water.
- A.chemicals
- B.gas
- C.sludge
-
What does the picture show? It’s a(n) ___________.
- A.stick
- B.anchor
- C.spade
-
Feed water heaters are necessary for ( ) to increase its efficiency
- A.the generator
- B.the boiler
- C.the main engine
-
May I know your name, please?( )
- A.This is my visiting card
- B.Let's go to the saloon
- C.Lovely day,isn't?
-
At sea, we usually use( ) to provide hot water.
- A.a heater
- B.an exhaust gas boiler
- C.an engine
-
The working stroke is also called ( ) strok
- A.compression
- B.expansion
- C.exhaust
-
Once a scavenging fire is detected, the engine ( )
- A.will be speeded up
- B.should be slowed down
- C.must slow down
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