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【单选题】
在氩气和二氧化碳混合气体保护焊中二氧化碳的加入量通常为（）。A.
5%-30%
B.
1%-5%
C.
15%-30%
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反馈参考答案：
举一反三
【单选题】“ We ’ ll do what we can to get the goods on time, ” said the manager of the company.
A.
reached
B.
arrived
C.
delivered
D.
come
【单选题】- What are you going to do tomorrow? - We ’ ll go to the library tomorrow if it ________.
A.
isn ’ t rain
B.
rain
C.
won ’ t rain
D.
doesn ’ t rain
【单选题】We' ll go to the forest. What do we need to take?
A.
life ring
B.
bathing suit
C.
comfortable shoes
D.
suitcase
【简答题】地面上某点到两目标的方向线垂直投影在水平面上所成的角称为水平角。
【简答题】Friendship likes a plant, if it is neglected, it will wither 2.Friendships ’ flourish basises for mutual respect 3.This article helps us to insight the problem. 4.We bound to do what we can do to ove...
【单选题】Jim : I ’ ve had a lot of trouble getting through to you. Your call centre wouldn ’ t put me through. Clerk : I ’ m sorry. We ’ ve been very busy this morning. Please explain the problem, and I ’ ll s...
A.
the phone
B.
calling
C.
center
【单选题】--What shall we do this weekend ? --We ’ ll drive to Dongjiang Lake _______boating.
A.
to go
B.
go
C.
to going
D.
going
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