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【多选题】
常用的细胞破碎方法有
A.
冻融法
B.
表面活性剂处理法
C.
酶处理法
D.
煮沸法
E.
超声破碎法
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【单选题】(Unit5TextB课文段落) The newspaper story addressed how this family is dealing with a lot of deep-seated issues. Yet, the plasma TV and European cars stand out as symbols of an illness that exists in our s...
A.
True
B.
False
【单选题】(Unit5TextB课文段落) What people typically fail to recognize is that advertisers target people with money to burn. We ’ re endlessly exposed to advertising directed at the rich. And things have gotten wor...
A.
these poor people
B.
these wealthy people
C.
these young people
D.
these old people
【判断题】三个刚片用三个铰两两相连,组成无多余约束的内部几何不变体系。
A.
正确
B.
错误
【判断题】三个本身无多余约束的刚片用三个不共线的单铰两两相连,则组成的体系为静定结构。()
A.
正确
B.
错误
【单选题】(Unit5TextB课文段落) In the depths of addiction, it often appears that there ’ s no way out. This is certainly the case with the cultural addiction of consumerism. We regularly hear that our economy is 70...
A.
True
B.
False
【判断题】三个刚片用三个单铰两两相连,组成的体系一定是无多余约束的几何不变体系。()
A.
正确
B.
错误
【判断题】三个本身无多余约束的刚片用三个不共线的单铰两两相连,则组成的体系为超静定结构。()
A.
正确
B.
错误
【单选题】(Unit5TextB课文段落) A recent story in my local newspaper dealt with a sad-case family. The son was in jail for drugs, and his mother was trying desperately to find a way to give her son hope. 题目: Why was...
A.
He stole many cars.
B.
He took drugs.
C.
He cheated his friends.
D.
He killed his friends.
【判断题】三个刚片用三个铰两两相连,则组成几何不变体系且无多余约束。
A.
正确
B.
错误
【判断题】三个刚片用三个铰两两相连,组成无多余约束的内部几何不变体系。
A.
正确
B.
错误
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