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【单选题】
二氧化碳气体保护焊送丝机有三种形式即( )、拉丝式和推拉丝式。A.
推丝式
B.
等速送丝式
C.
变速送丝式
D.
无级变速式
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举一反三
【单选题】The spectrum of optical fiber communication belongs to ( )
A.
Visible light
B.
Ultraviolet light
C.
I nfrared light
D.
X-ray
【单选题】— Are you cleaning my room, Lily? — ______. I can’t bear seeing your room in a mess!
A.
I can’t help it
B.
Not at all
C.
You are clever
D.
No chance
【简答题】使用扳手时,应使拉力作用在____的一边。
【多选题】在炼钢过程中碳氧反应的作用( )。
A.
加大钢－渣界面，加速物理化学反应的进行,搅动熔池，均匀成分和温度
B.
有利于非金属夹杂的上浮和有害气体的排出
C.
有利于熔渣的形成,放热升温
D.
爆发性的碳氧反应会造成喷溅
【简答题】在炼钢过程中碳氧反应的作用是什么？
【单选题】Take a few, add a few, for example, I can't keep my room straight.This sentence implies:
A.
My room is always in a mess.
B.
I can't make my possessions in a line.
C.
My room is not suitable to live in.
D.
My room is always very clean and tidy.
【单选题】My friends didn’t tell me ________ .
A.
which room he lived in
B.
which room he lived
C.
which room did he live lin
D.
which room does he live in
【单选题】听力原文：W: My room smells of cigarette smoke. I can't stand it. Could you change my room, please? M: Let me see... I'm sorry, but we don't have any more non-smoking rooms. We won't charge you for your ro...
A.
The woman doesn't want to pay for the room.
B.
The woman likes smoking.
C.
The woman wants to have a non-smoking room.
D.
There's no more room in the hotel.
【单选题】I don’t allow __ in my drawing-room. I don’t allow my son __ at all.
A.
to smoke; smoking
B.
smoking; to smoke
C.
to smoke; to smoke
D.
smoking; smoking
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