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【单选题】
4-2 下列分子式的异构体中的手性碳标示正确的是哪一个?A.
a：( 2R,3S ) b：( 2R,3R )
B.
a：( 2S,3S ) b：( 2R,3R )
C.
a：( 2S,3R ) b：( 2S,3R )
D.
a：( 2R,3R ) b：( 2S,3S )
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皮皮学刷刷变学霸
举一反三
【单选题】在稳定的工作状态下，电弧焊电源输出端电压与输出端电流之间的关系称为（）。
A.
电弧焊电源的外特性
B.
弧焊电源的动特性
C.
弧焊电源的静特性
D.
弧焊电源的调节性
【多选题】网络招聘可以通过以下渠道：
A.
注册成为专业人才网站的会员，在专业人才网站上发布招聘信息，寻找合适应聘者
B.
利用公司主页或网站发布招聘信息
C.
利用一些浏览量大的网站发布招聘信息
D.
利用百度发布招聘信息
【简答题】The most common causes of stress in family life are finances, work and health. The financial situation is the cause most often cited for stress in family life. When there are money problems, people 1 ...
【单选题】When people are unemployed, two major sources of stress come into play. One is the loss of income, with all the financial hardships that this brings. Suddenly there are the difficulties of paying the ...
A.
to inform readers about the major sources of stress for the unemployed.
B.
to persuade readers that unemployment should be eliminated.
C.
to amuse readers with observations about human nature.
【简答题】Read the following passage carefully and choose the best word or phrase to fill in each blank. I was in a bad temper. It was just like the stress in my life that was 1 out of control. I could Probably...
【简答题】Iwas in a bad temper. It was just like the stress in my life that was 1 outof control. I could probably 2 it to financial stress. My company was cuttingjobs and they were 3 each worker’s performance. ...
【判断题】下面两个类A和B 不在 同一个包中,标号1和2的语句均是正确的。 package p1 ; public class A{ private int i; public void m(){ } } import p1.A; package p2 ; public class B{ public void m(){ A a = new A(); // (1) a.m();// (2) } }
A.
正确
B.
错误
【判断题】下面两个类A和B 不在 同一个包中,标号1的语句是正确的。 package p1 ; class A{ private int i; public void m(){ } } import p1.A; package p2 ; public class B{ public void m(){ A a = new A(); // (1) a.m();// (2) } }
A.
正确
B.
错误
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