单项选择题

The refrigerating agent can _____ at low temperature in the evaporator.
A.expand
B.evaporate
C.condense
D.distil

A.
A.expand
B.evaporate
C.condense
D.distil

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人们常说，记者好像比别人多长了一只鼻子，这是指记者具备( )。

A.专业水平
B.业务素质
C.新闻敏感
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_____ can be operated independently or locked together and operated as a twin-job cranes of double capacity.
A.Two derricks
B.A derrick and a crane
C.Two cranes
D.A crane and a winch

A.
A.Two
B.A
C.Two
D.A