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【多选题】
当使物体发生变形的因素去掉后,物体不能恢复原来的形状,这种变形叫做塑性变形。塑性变形特征有( )A.
塑性变形是在弹性变形的基础上发生的。
B.
应力和变形不是直线关系,即不遵守虎克定律。
C.
塑性变形过程中,外力不但改变了原子间距,而且破坏了原来的原子间联系,建立了新的联系。
D.
塑性变形能改变材料的机械和物理性质。
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【简答题】句型转换。（5分） 1.Simon does his homework in his bedroom every night.(改为否定句) Simon __________ __________ his homework in his bedroom every night. 2.Millie plays badminton for an hour every day.(写出同义句) Mill...
【简答题】句型转换。 1.Simon does his homework in his bedroom every night.(改为否定句) Simon ________ ________ his homework in his bedroom every night. 2.Millie plays badminton for an hour every day.(写出同义句) Millie _____...
【简答题】Simon thought his computer was broken _______ his little brother pointed out that he had forgotten to turn it on. A．until B．since C．after D．because
【单选题】在应用中,如何提高变频器模拟量输入信号抗干扰能力?
A.
设计更可靠的模拟量-数字信号采集电路
B.
降低数字滤波延时时间常数
C.
提高数字滤波延时时间常数
D.
由硬件电路决定，应用中没有办法改善
【单选题】Simon thought his computer was broken _____ his little brother pointed out that he had forgotten to turn it on. [ ]
A.
until
B.
unless
C.
after
D.
because
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