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【判断题】
判断:当蛋白质周围层的ζ电位足够大时,静电排斥作用抵御蛋白质分子之间的分子间力,使蛋白质溶液处于稳定状态而难以沉淀。A.
正确
B.
错误
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皮皮学刷刷变学霸
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【简答题】世界公认的的五大投资金币为,()的鹰洋金币,中国的()金币,()的克鲁格金币,澳大利亚的()金币以及()的枫叶金币
【单选题】— How long has your brother been working in this factory? — he graduated from college.
A.
When
B.
By the time
C.
Until
D.
Ever since
【单选题】How long has your daughter been missing? ().
A.
I miss my daughter a lot.
B.
We haven't seen each other for two months.
C.
About half an hour. I've been looking for her everywhere.
【简答题】圆锥表面上点的投影,可以采用_________和___________两种方法求取。
【单选题】--- How long has your brother the computer? --- About two weeks.
A.
bought
B.
had
C.
received
D.
borrowed
【简答题】圆锥表面上点的投影,可以采用_________和___________两种方法求取。
【单选题】How long has your brother ___ the army?
A.
joined
B.
taken part in
C.
been
D.
served in
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