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【单选题】
关于水准测量做法正确的是( )。A.
任何等级水准测量都应尽量保持前后视距相等
B.
水准测量外业结束后，可以直接转入内业计算
C.
水准仪i角误差可以通过前后视距相等来消除，作业前可以不检查i角
D.
如果没有标尺零点差，水准标尺前后互换是可以的
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【简答题】A．肽键 B．氢键 C．二硫键 D．疏水作用 E．3′，5′-磷酸二酯键 蛋白质一级结构中的主要化学键 A． B． C． D． E．
【简答题】A．肽键 B．氢键 C．二硫键 D．疏水作用 E．3′，5′-磷酸二酯键 蛋白质一级结构中的主要化学键
【单选题】Questions 5 to 8 are based on the conversation you have just heard.
A.
7. A) They are a healthy choice for elderly people.
B.
B) They are especially popular among Italians.
C.
C) They symbolize good health and longevity.
D.
D) They go well with different kinds of food.
【简答题】聚酰胺66粉末
【单选题】Questions 5 to 8 are based on the conversation you have just heard.
A.
Because he is often busy writing books.
B.
Because he usually has meetings.
C.
Because he always gets up very late.
D.
Because he often goes out to exercise.
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