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【单选题】
气缸压力表检测气缸压缩压力时，测得压力如高于原设计规定，可能的原因是( )。A.
燃烧室内积碳过多
B.
气缸磨损过大
C.
气门关闭不严
D.
气缸漏气
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【单选题】(2013·合肥一检)According to the rules and regulations, all payments ________ be made in cash in the shopping center.
A.
shall
B.
can
C.
must
D.
should
【单选题】In the United States,contractors must earn their progress payments,and no ( ) are made.
A.
working capital
B.
final account
C.
cost estimate
D.
up-front payments
【单选题】Don’t worry, sir! All payments ____ be made by the end of the month.
A.
will
B.
shall
C.
can
D.
must
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