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【判断题】
注射成型是将固体的粉状或粒状塑料材料倒入注射机的进料槽,经由柱塞或旋转将塑料原料向前推进,同时予以加热与加压,到达柱塞或前端的喷嘴时,将已呈熔融状态的塑料原料注入成型模具内,待冷却硬化定型后,打开模具,推出成品。这类方法主要用于热塑性塑料材料的成型加工,但也有些热固性塑料材料采用此法。A.
正确
B.
错误
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】A．Men and women like to argue. B．Men and women talk and think in different ways. C．Men and women are very similar. D．Men and women are likely to get angry.
【简答题】A．Men are stronger than women. B．Men are more talkative than women. C．Men use language more than women. D．Men have greater power than women.
【多选题】完全竞争市场的特征是( )
A.
市场上众多的买者和卖者都是既定价格的接受者
B.
所有卖者提供的产品都是同质的
C.
所有卖者提供的产品可以是不同质的
D.
具有完全信息
E.
厂商可以自由进入或退出
【单选题】在磁罗经罗经柜内左右两边水平纵向放置的磁棒为（）校正器，用于校正罗经的（）。
A.
硬铁；半圆自差力
B.
硬铁；象限自差力
C.
软铁；半圆自差力
D.
软铁；象限自差力
【单选题】In a lot of countries, women earn() (相比较而言) lower wages than men, even if they are doing the same job.
A.
exclusively
B.
experimentally
C.
comparatively
D.
favorably
【单选题】Men and women ______________.
A.
differ physically in some limited ways
B.
are different in that men are physically superior to women
C.
are different in that women are physically superior to men
D.
are physically equal
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