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【单选题】
螺钉的公称直径是10mm，螺钉旋入螺纹的长度bm与旋入零件的材料有关，如果旋入零件的材料是钢，则bm=？A.
10左右
B.
15左右
C.
20左右
D.
None
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反馈参考答案：
举一反三
【单选题】Question 35 Choose the correct letter A-D. The noise levels at the site can reach
A.
45 decibels.
B.
55 decibels.
C.
67 decibels.
D.
70 decibels.
【单选题】choose the correct answer
A.
The salary.
B.
The commission.
C.
The right job.
D.
The interpersonal relations.
【单选题】•Read the passage about the job of store assistants. •Choose the correct word A, B, C or D from below the passage to fill each gap. •For each question (19-33) , mark one letter (A, B, C or D) on your ...
A.
stored
B.
provided
C.
stocked
D.
packed
【简答题】choose the correct answer for the sentences in column A
【单选题】choose the correct answer
A.
The Export department.
B.
The Planning department.
C.
The Publicity department.
D.
The Import department.
【简答题】什么叫渗碳钢？为什么一般渗碳用钢的含碳量都比较低？合金渗碳钢常含有哪些元素？它们对钢的组织与性能有何影响？
【单选题】Complete the diagram below. Choose the correct letter A-E from the box below. Write your answers in boxes 19-23 on your answer sheet.
A.
Gliese581c
B.
Gliese581d
C.
Gliese581e
D.
Gliese 581g
E.
Earth (19)
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