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【单选题】
在能见度不良的水域中,多艘被拖船的最后一艘,如配有船员,每次不超过____的间隔连续鸣放____的声号A.
2分钟
B.
一长两短
C.
1分钟
D.
一长两短
E.
2分钟
F.
一长三短
G.
1分钟
H.
一长三短
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皮皮学刷刷变学霸
举一反三
【单选题】The higher the cetane number, _____ the ignition quality of the fuel.
A.
the worse
B.
the better
C.
the smaller
D.
the greater
【单选题】With economy increasing steadily, people ______ enjoy a life of higher quality.
A.
should
B.
can
C.
may
D.
must
【单选题】Fuels of high quality with their earlier ignitions will cause higher _____ pressure in cylinders of a diesel engine.
A.
compression
B.
maximum
C.
rated
D.
oil
【简答题】在入栈时,应先判别栈是否为____;在出栈时,应先判别栈是否为____。
【单选题】In author's opinion, the sudden appearance of higher-quality goods suggests its officials ______.
A.
become more concerned about the quality and domestic market
B.
turn to other ways to stimulate and enforce export rules
C.
have to improve goods' quality for the qualification of exports
D.
want consumers to buy better products at low prices
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