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【简答题】
在曲柄摇杆机构中,当以 ____为主动件时,有“死点”位置产生。 当以____为主动件时,机构具有急特性
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举一反三
【简答题】Modern systems can offer _____ (领航,导航)information with real-time traffic updates.
【单选题】______, I didn't know how to use the machine.
A.
At beginning
B.
At first
C.
At start
【简答题】Flexible working Nowadays, many people are trying to balance their working life with a busy home life. Our hours extend beyond nine-five and with so much traffic on the road, the daily commute is also...
【单选题】With modern traffic control facilities, speeders can't expect to escape _____ detected and fined.
A.
to be
B.
being
C.
to have been
D.
having been
【单选题】With modern traffic contral facilities, speeders can't expect to escape _____ detected and fined.
A.
to be
B.
being
C.
to have been
D.
having been
【简答题】静电场是 源场,源为 ,同时也是 散场, 旋场。
【多选题】对于统计学中常用基本概念，下列说法正确的是（）。
A.
统计总体中的每一个个体被称为总体单位，也称为样本
B.
描述总体特征的指标有数量标志与品质标志
C.
样本单位必须取自总体内部，从一个总体中可以抽取许多种不同的样本
D.
描述总体特征的指标是从个体的标志值汇总而来
E.
变异来自同一总体不同个体之间标志值上的差异，是统计核算的前提条件
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