单选题：To improne the pmlity of our products we uaked for nuggratio

题目内容：

To improne the pmlity of our products we uaked for nuggratior a had used the producu A．whacver
B．who
C．whichever
D．which

参考答案：

答案解析：

Mistakes don’t just happen; they occur for a reason. find ou

Mistakes don’t just happen; they occur for a reason. find out the reason,and the

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The main purpose of the text is to _______.A. describe children’s thinkingB.answ

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如图1所示，宽度为d的竖直狭长区域内（边界为l1、l2），存在垂直纸面同里的匀强磁场和竖直方向上的周期性变化的电场（如图2所示），电场强度的大小为E，E>0表示

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