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【判断题】
内侧纵弓又称为弹性弓,此弓的最高点为舟骨。A.
正确
B.
错误
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举一反三
【单选题】The lawyer seldom wears anything other than a suit ________ the season.
A.
whatever
B.
wherever
C.
whenever
D.
however
【简答题】机械的自锁现象是指由于机械中存在摩擦的缘故，在一定的几何条件下，即使把驱动力增加到无穷大能够大，，也无法使它运动，这种现象称为机械的自锁。()
【单选题】在机械工程中，有些机构要求自锁，有些则要求防止自锁，试在下列各机构中指出哪些是要求自锁的。 ( )
A.
自卸车的自卸机构
B.
摇臂钻床的摇臂升降
C.
螺旋千斤顶
D.
螺纹联结的螺栓和螺帽
【简答题】Unit 3 ... I went snorkelling on the reef offshore this morning. ... Seeing such 小题1: , I think every cell in my body woke up. ... The first thing I 小题2: was all the vivid colours surrounding me—purpl...
【单选题】A carbon dioxide fire extinguisher should be recharged ______.
A.
at least annually
B.
whenever it is below its required weight
C.
only if the extinguisher has been used
D.
before every safety inspection
【单选题】________ difficult the situation is, we'll help one another to overcome it. [ ]
A.
Whatever
B.
Whenever
C.
Wherever
D.
However
【单选题】Blues was said to be created in the late 19thcentury by ____________ that were forced to work in cotton fields.
A.
black slaves
B.
whites
C.
Asians
D.
Japanese
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