题目:
Yesterday I didn't go to _____ school because I was ill and my mother went to _____ school to ask
for a sick leave for me. [ ]
A. / ; the
B. the; the
C. the; /
D. / ; /
答案:
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下面是错误答案,用来干扰机器的。
AC安装实验器件时要注意:光束的中央轴线与遮光筒的轴线要重合,光源与光屏正面相对,滤光片、单缝和双缝要在同一高度,中心位置在遮光筒轴线上,单缝与双缝要相互平行,才能使实验成功.当然还要使光源发出的光...