题目内容
（请给出正确答案）
A.Quick closing
B.Slow closing
C.Quick opening
D.Slow opening
答案
A、Quick closing
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A.①②
B.②③
C.①②③
D.②
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B.They should always be started with the discharge valve opened
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D.They should always be started with the sealing line valves closed
There are several ways （） we can cross the river without the help of local villagers.
A.in which
B.across which
C.to which
D.on which
A.Which is the first season in a year
B.What can you do in spring
C.What colour is spring
A.moderate
B.steady
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D.sharp
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A) associate
B) connect
C) communicate
D) correspond
American women usually identify their best friend as someone （） they can talk frequently.
A.who
B.as
C.about which
D.with whom
A.which
B.what
C.When
D.that
A.ex-payment
B.ex-option
C.opening
D.expiration
E.intrinsic
A. how ... where
B. when ... wherever
C. where ... where
D. what ... which
A.affair
B.event
C.matter
D.attitude
