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【单选题】
房室延搁的生理意义A.
使QRS波增宽
B.
使心室肌有效不延长
C.
使心室肌不会产生收缩
D.
使心房心室不会产生重叠收缩
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【简答题】凸模和凹模的刃口磨损后,模具尺寸的变化(根据落料模)可分为 ____________ , ___________________ 和 _____________________ 三类。
【单选题】What is true about all three people?
A.
They are all university students.
B.
They all made a cultural mistake.
C.
They all learned something important.
【单选题】听力原文：Are we all going on the trip? (A) No, we leave at 4. (B) No, just James and me. (C) Yes, I'm glad they went. (14)
A.
B.
C.
【简答题】These are all my favourite (topic).
【简答题】above all
【单选题】—Your watch is so beautiful. It must be expensive. —Not at all. It only ______ $4. [ ]
A.
cost
B.
spent
C.
took
【单选题】How can you _______ yourself promoted if you just stay here, doing nothing at all?A．doB． conside
A.
4. How can you _______ yourself promoted if you just stay here, doing nothing at all? A．do
B.
consider
C.
cause
D.
Get
【单选题】可以用来对凸模、凹模镶快、电火花加工用的电极等的成形表面进行精加工，它可以加工硬质合金和热处理后硬度很高的模具零件，对制造高精度、长寿命的模具有十分重要的意义。
A.
刨模机床加工
B.
成形磨削
C.
压印锉修
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