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问题
单项选择题
非防爆电器入井必须在（）登记。
A.调度站
B.单位
C.副井口登记
答案
参考答案：C
单项选择题
粉末直接压片常选用的助流剂是（）
A.糖浆
B.微晶纤维素
C.微粉硅胶
D.PEG6000
E.硬脂酸镁
查看答案
选择题
—Why am I so slow at doing the cloze test?
—I guess you didn’t realize the use _____ the contexts.
A．you should have made of
B．you must have made from
C．of which you could have from
D．out of which you need make
查看答案
—Why am I so slow at doing the cloze test?