A.If the first stand-by set failed
B.If the first stand-by set fails
C.If the first stand-by set will fail
D.If the first stand-by set doesn’t fail
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A.in addition to
B.in addition that
C.except for
D.except where
A.shall take over
B.shall not take over
C.shall hand over
D.shall not hand over
A.as long as
B.unless
C.despite
D.till
A.power
B.speed
C.resistance
D.thrust force
A.take；save
B.to take；save
C.take；to save
D.to take；to save
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