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【单选题】
我国开启式压缩机中的轴封广泛采用摩擦环式轴封。橡胶密封圈和转动摩擦环形成径向静密封,()形成径向动密封。A.
橡胶密封圈和轴颈
B.
橡胶密封圈和转动摩擦环
C.
转动摩擦环和压的
D.
橡胶密封圈和压的
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举一反三
【单选题】It was _ lovely day _ we'll go for a walk.
A.
such as that
B.
so; that
C.
so;as
D.
as; as
【单选题】Her daughter was so lovely _____ little girl that everybody in the street would smile at her at _____ first sight.
A.
a; /
B.
the; a
C.
the; the
D.
/; the
【单选题】It was __ lovely day that we decided to go for a picnic.
A.
such a
B.
so a
C.
such
D.
so
【单选题】将有关离子浓度增大5倍,φ 值保持不变的电极反应是( )
A.
Cu2++2e- ↔Cu
B.
MnO4-+8H++5e-↔Mn2++4H2O
C.
Cl2+2e-↔2Cl-
D.
Cr3++e-↔Cr2+
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