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【单选题】
在制冷系统工作时,用纸板或其它覆盖物挡住冷凝器的散热,以恶化其冷却效果,这时冷凝器的温度会逐渐升高,当高压表压力: 时,电磁离合器应立即断电。A.
低于0.21MPa
B.
高于0.21MPa
C.
低于2.1～2.5MPa
D.
高于2.1～2.5MPa
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举一反三
【单选题】I have known him for ten years. I ___ to know him in 2010.
A.
got
B.
have got
C.
was getting
D.
get
【简答题】混凝土输送泵可分为( )和( )两类。
【单选题】Now he is artist . I have known him since he was one- year-old boy .
A.
a, an
B.
a, a
C.
an, an
D.
an, a
【单选题】I have known him for ten years. I ____________to know him in l999.
A.
got
B.
have got
C.
was getting
D.
get
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