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【单选题】
无菌盘的有效期不超过( )A.
4 小时
B.
24 小时
C.
3 天
D.
14 天
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举一反三
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their ( ) birth rates have also posed problems.
A.
prejudiced
B.
respective
C.
fluctuating
D.
enlightening
【单选题】Western nations have older and shrinking populations since they entered the 21st century and their _____ birth rates have also posed problems.
A.
fluctuating
B.
flourishing
C.
enlightening
D.
motivating
【单选题】Western nations have older and shrinking populations since they entered 21 st century and their _____ birth rates have also posed problems.
A.
high
B.
lowering
C.
fluctuating
D.
improving
【单选题】. -- What does the sign on the wall read? --“ No person ______ enter it without permission.”
A.
will
B.
may
C.
shall
D.
must
【简答题】— What does the sign over there read? —“No person __________ smoke or carry a lighted cigarette，cigar or pipe in this area.” A．will B．may C．shall D．must
【简答题】永磁同步电动机转子位置检测多用( ) A.光电式转子位置检测器 B、磁电式转子位置检测器 C。绝对式脉冲编码器 D。相对式脉冲编码器
【单选题】— What does the sign over there say? — No person _________ bring drinks into the student computer room.
A.
will
B.
may
C.
shall
D.
must
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