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【单选题】
密封效果最好的静密封( )。A.
研磨面密封
B.
垫片密封
C.
密封胶密封
D.
密封圈密封
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举一反三
【单选题】Everyone in the class is expected to________in the discussion.
A.
participate
B.
attend
C.
donate
D.
declare
【简答题】The students often have (heat) ___________ discussion in the class.
【单选题】听力原文：M: Professor White is really into class discussion. Almost in every of his class he would organize class discussion. To be honest, I'm fed up with it. W: Really? Don't you feel it enjoyable and q...
A.
It wastes time.
B.
It is enjoyable.
C.
It benefits the class.
D.
It is good but needs improving.
【简答题】磁感线可以形象地表示磁场的_______和它的______情况，磁体外部的磁感线是从它的______极出来，回到它的______极。
【单选题】（）是指开证行在收到委托收款行或议付行的国内信用证项下来单后，应开证申请人要求，给予开证申请人的短期资金融通，用以支付该信用证项下应付款项的一种融资产品。
A.
买方押汇产品
B.
卖方押汇产品
C.
国内信用证打包放款
D.
进口押汇
【单选题】What are the students doing when the man arrives in the class?
A.
Having a class discussion.
B.
Giving presentations.
C.
Drawing graphs.
D.
Taking an exam.
【简答题】磁感线可以形象地表示磁场的______和它的______情况，磁体外部的磁感线是从它的______极出来，回到它的______极．
【简答题】A．The man and the woman have the same opinion about the class discussion. B．It is usually too noisy to bear the class discussion C．Many students pay no attention to the class discussion. D．Some studen...
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