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【单选题】
()是线接触,承载能力大,抗冲击和振动A.
滚子轴承
B.
滚动轴承
C.
固定轴承
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举一反三
【单选题】With the help of high technology, more and more new substances ______ in the past 10 years.
A.
discovered
B.
have discovered
C.
had been discovered
D.
have been discovered
【单选题】A man escaped from the prison last night. It was a long time __________ the guards discovered what had happened.
A.
before
B.
until
C.
since
D.
when
【简答题】Scientists at Royal Holloway, University of London and Queen Mary, University of London have discovered that bees learn to fly the shortest possible route between flowers even if they discover the fl...
【简答题】采用非接触式光学扫描仪进行采集数据前,物体需要做哪些前处理?
【单选题】与实体商品相比较,服务的特质及组成服务的元素,在许多情况下都是无形无质 的,让人不能触摸或感觉到其存在。 这是指服务的_________。
A.
不可触知性
B.
品质差异性
C.
不可分割性
D.
易逝性
【单选题】If Newton lived today, he would be surprised by what _______ in science and technology.
A.
had discovered
B.
had been discovered
C.
has discovered
D.
has been discovered
【简答题】C语言中一个单精度浮点型数据占（ ）个字节。
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