A.实施
B.筹资
C.返修
D.停工
第1题
The motor for the fresh water pump ______.
A.need to repair
B.need to be repaired
C.needs to repair
D.needs repairing
第2题
If a small electric motor is immersed in salt water it should be _____(1) washed in fresh water; (2) dried in an oven
A.(1) only
B.(2) only
C.both (1) and (2)
D.neither (1) or (2)
第3题
We must use () to change sea water into fresh water.
A.fresh water pump
B.sea water pump
C.fresh water generator
第4题
We use () to distill fresh water from sea water
A.sea water pump
B.fresh water pump
C.fresh water generator
第5题
We can make use of seawater by ______ fresh water from it.
A.purifying
B.refraining
C.distilling
D.performers
第6题
A.the small amount of fresh water is constantly being replaced by rainfall
B.some of the water has been polluted
C.our need for fresh water is increasing rapidly
D.huge amount of the water on earth is seawater
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