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【单选题】
有一粗牙普通螺纹的公称直径为20mm，螺距是2.5mm，单线，中径公差带代号为5H ，公差带代号是5H，旋合长度为L，右旋。则正确的标记为（ ）A.
M20-5H
B.
M20x2.5-5H
C.
M20-5H5H
D.
M20x2.5-5H5H
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【简答题】先导化合物
【单选题】Which statement is not true of the performer of acupuncture?
A.
He knows where to place the needles without pain.
B.
He knows where the operation is to be performed.
C.
He knows how to perform. the operation to cure the patient.
D.
He knows how to use the needles in an operation.
【简答题】先导化合物
【简答题】先导化合物
【单选题】— Why is your father in such a hurry? — He _____ for Beijing to attend an important meeting. The plan _____ at six. [ ]
A.
will leave; leave
B.
is leaving; leaves
C.
is leaving; will leave
D.
leaves; is leaving
【简答题】先导化合物
【单选题】What he described as only a ______ detail I thought was the most important part of the plan.
A.
common
B.
plain
C.
just
D.
mere
【单选题】It is the most instructive lecture that I _____ since I came to this school. [ ]
A.
attended
B.
had attended
C.
am attending
D.
have attended
【单选题】Which of the following italicized parts is a subject clause?
A.
He will have it that our plan is really practical.
B.
My hope is that he will keep it a secret for ever.
C.
It now appears that they are in urgent need of help.
D.
It happened on the day that he was born.
【简答题】先导化合物
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