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【判断题】
( )曲柄压力机的液压式过载保护装置的过载临界点可以准确的设定,而且过载后设备恢复容易,广泛用于中大型压力机。A.
正确
B.
错误
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举一反三
【简答题】Three things are necessary for us to keep alive. What are they? They are air, water and food. We eat food twice 46 three times a day. We drink water several times a day. We breathe air day and 47 . If...
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
had
B.
used to have
C.
used to be
D.
are
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
use to
B.
use to have
C.
use to be
D.
are
【单选题】—Look, there _____ many birds around here, but now we seldom see them. What a pity! —Yeah! The air pollution has caused the problem! [ ]
A.
are
B.
used to have
C.
used to be
D.
use to have
【单选题】There _____ many kinds of birds around here, but now we seldom see them because of the air pollution. [ ]
A.
use to
B.
use to have
C.
used to be
D.
are
【单选题】—Look, there_____ many birds around here, but now we hardly see them. What a pity! —Yeah! The air pollution has caused the problem!
A.
are
B.
used to have
C.
used to be
D.
use to be
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