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搜题
【单选题】
关于空压机气阀升程,以下说法错的是_____。A.
严格限制，多在2～4mm左右
B.
不宜过大，以免关闭滞后和撞击加重
C.
工作中随流量而变
D.
转速高的及工作压力大的升程较小
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举一反三
【单选题】She is neither_______ Chinese, nor _______ European. She is from _______Australia.
A.
a; an; /
B.
a; an; the
C.
a; a; /
D.
an; an; /
【单选题】17) She is neither_______ Chinese, nor _______ European. She is from _______Australia.
A.
a; an; /
B.
a; an; the
C.
a; a; /
D.
an; an; /
【单选题】The writer is a little girl._______ . She can hardly draw a teacher's attention,especially when she is shy and self-abased.
A.
She is pretty as well as clever.
B.
She is shy and self -abased.
C.
She is neither pretty nor clever.
D.
She is neither shy nor self- abased.