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【多选题】
酶的特异性(专一性)可分为A.
相对特异性
B.
变构特异性
C.
绝对特异性
D.
立体异构特异性
E.
旋光特异性
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反馈参考答案：
举一反三
【简答题】请写出四点法建立工具坐标系的步骤。
【简答题】简述,此零件利用面、线、点的3-2-1法建立坐标系的步骤!
【单选题】以下在数控车床上建立外圆车刀X轴坐标系的步骤正确的是( )
A.
试切外圆→刀具沿Z向退出→测量试切外圆直径→输入到对应的刀偏号中
B.
试切外圆→刀具沿Z向退出→测量数值→输入刀补
C.
试切端面→刀具沿X向退出→测量数值→输入刀补
D.
试切端面→刀具沿X向退出→输入Z0到对应的刀偏号中
【单选题】听力原文：Jack, you're talking big about how great your team is and how bad they'll beat my team on Saturday. Let's bet fifty dollars on who win. Let's see you put your money where your mouth is. What does...
A.
He's boasting of his own team.
B.
He's speaking ill of the speaker's team.
C.
He likes to bet money for his team.
D.
He enjoys betting with the speaker.
【单选题】听力原文：Jack, you're talking big about how great your team is and how bad they'll beat my team Saturday. Let's bet fifty dollars on who wins. Let's see you put your money where your mouth is. What does t...
A.
He's boasting of his own team.
B.
He's speaking iii of the speaker's team.
C.
He likes to bet money for his team.
D.
He enjoys betting with the speaker.
【单选题】为表示关系 100≥b≥0 ,应使用 C 语言表达式
A.
(100>=b)&&(b>=0)
B.
(100>=b)and(b>=0)
C.
100>=b>=0
D.
(100>=B)&&(B>=0)
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