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【多选题】
数控车床与普通车床一样,也是用来加工零件的回转表面的。以下的描述中哪些零件表面适合数控车床自动加工呢?A.
内外圆柱表面
B.
圆锥面、球面、双曲面
C.
螺纹
D.
手机壳的外表面
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举一反三
【简答题】Translate the selection into Chinese. Apart from the fact that he was at this moment disguised in the uniform of a clergyman, there was nothing very sinister about Mr Cyril Boggis. By trade he was a d...
【单选题】How does Nick feel about the way Dean and his sister planned the fake endorsement deal?
A.
angry because he didn't think they were crazy enough to do it
B.
disappointed because he didn't think they were mean enough to do it
C.
surprised because he didn't think they were intelt enough to do it
【单选题】According to Nick, Dean didn't expect something to happen. What?
A.
He didn't expect Nick to believe that the endorsement deal was real.
B.
He didn't expect Nick to figure out that Dean had tricked him.
C.
He didn't expect Coach to kick Nick off the team.
【简答题】请述胰岛素的生理作用和分泌调节。为什么胰岛素缺乏时会引起糖尿病？参与钙、磷代谢的激素各自的主要生理作用。
【单选题】下列对胰岛素的叙述不正确的是
A.
胰岛素由A、B两个肽链组成，共16种51个氨基酸
B.
胰岛素在体内起调节糖代谢作用，是治疗糖尿病的有效药物
C.
胰岛素是由胰β-细胞受内源或外源性物质如葡萄糖等的激动而分泌的一种蛋白质激素
D.
猪胰岛素是人胰岛素的替代品，二者作用完全相同
E.
我国科学家最早完成胰岛素的全合成
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