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【单选题】
凸轮机构从动杆的运动规律,是由( )所决定的。A.
凸轮的压力角
B.
从动杆 滚子 的直径
C.
从动杆的 形状
D.
凸轮的轮廓曲线
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举一反三
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hopeful
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relaxing
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hopelessly
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hopeless
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A.
and
B.
but
C.
because
D.
so
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A.
alien
B.
foreig n
C.
vague
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【单选题】下面几种溶液: 1 0.1mol·L -1 Al 2 (SO 4 ) 3 2 0.2mol·L -1 ZnSO 4 3 0.3mol·L -1 NaCl 4 0.3 mol·L -1 蔗糖 。按溶液的 渗透压 由高到低排列,顺序正确的是( )
A.
①②③④
B.
③④②①
C.
④②①③
D.
④②③①
E.
③①②④
【单选题】I felt uncomfortable _________ there was a long silence during the meal.
A.
and
B.
because
C.
but
D.
so
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【单选题】I felt very _______ during my first hours in the country
A.
alien
B.
foreig n
C.
vague
D.
queer