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【单选题】
用单纯形法求解线性规划问题时引入的松弛变量在目标函数中的系数为:A.
0
B.
1
C.
正数
D.
负数
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
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【单选题】用量角器测量关节活动范围时，量角器固定臂的正确放置方法是
A.
与构成关节的远端骨长轴平行
B.
与构成关节的近端骨长轴平行
C.
与构成关节的远端骨长轴垂直
D.
与构成关节的近端骨长轴垂直
【简答题】海水是巨大的资源宝库，海水淡化及其综合利用具有重要意义。 完成下列填空： （1）氯碱工业主要以食盐为原料。为了除去粗盐中的Ca 2+ 、Mg 2+ 、SO 4 2 － 及泥沙，可将粗盐溶于水，然后进行下列操作，正确的操作顺序是 。 ①过滤；②加过量的NaOH溶液；③加适量的盐酸；④加过量的Na 2 CO 3 溶液；⑤加过量的BaCl 2 溶液 a．②⑤④①③ b．①④②⑤③ ...
【单选题】I like these lessons __________ we do some fun activities.
A.
so
B.
because
C.
but
D.
and
【单选题】As viewed from space, the Earth's distinguishing characteristics are its blue waters and white clouds. Enveloped by an ocean of air consisting of 78% nitrogen and 21% oxygen, the planet is the only on...
A.
One-fourth.
B.
One-half.
C.
Three-fourths.
D.
All of it.
【简答题】Revising Essays for Support Formula for Happiness Essay 1 1 1 Everyone has his or her own formula for happiness. 2 As we go through life, we discover the activities that make us feel best. 3 I've alre...
【简答题】If you are like me, your parents may also make you take part in after-class activities. And you always listen to them. But we are older now. We should start to do what we like. My parents used to make...
【单选题】Study these paragraphs and select the correct comment about the writing style. I think that essay writing is an important skill for all of us students. Don’t you see how many marks are given for this?...
A.
Formal, straightforward, clearly written, correct academic style
B.
Informal, like spoken (colloquial) language, incorrect academic style
C.
Too formal, uses too many words, incorrect academic style
【简答题】While learning the science lessons，I used to get a doubt—why ear，nose，tongue and eyes should be called as special senses？The basic reason is that these are the channels through which we maintain conta...
【简答题】第三部分完形填空（共20小题；每小题1分，满分20分） 阅读下面短文，掌握其大意，然后从每题所给的四个选项中，选出最佳选项。 Dear Lee, Thank you for your note．I like your _26_ between death and failure．I had not thought of these two in the same way __27__ you de...
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