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【单选题】
建筑石膏的主要化学成分( )A.
CaSO 4 ·1/2H 2 O
B.
CaSO 4 ·2H 2 O
C.
CaSO 4
D.
Ca(OH) 2
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【单选题】设计一直动从动件盘形凸轮,当凸轮转速ω及从动件运动规律v=v(s)不变时,若αmax由40°减小到20°,则凸轮尺寸会 。
A.
增大
B.
减小
C.
不变
D.
没有关系
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A.
to catch
B.
caught
C.
catching
D.
to be caught
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A.
until
B.
that
C.
when
D.
while
【简答题】维生素E的抗氧化能力很强，能抑制细胞膜上的脂质过氧化作用。（ ）
【简答题】完形填空。 It was one of the hottest days of the dry season. We had not seen 1 _ for almost a month. The crops were dying. If it didn't rain soon, we would lose everything. At noon, when I was 2 lu...
【简答题】已知下三角矩阵A m*n 以行序为主序压缩存储于一维数组 B[n(n+1)/2+1]中,则 在B中的对应下标为___ , 在B中的对应下标为 ____ 。
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