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问题
单项选择题
涂抹耐酸胶泥和耐酸砂浆，要求基层的湿度不大于______%。
A．5
B．6
C．7
D．8
答案
参考答案：A
单项选择题
槽式反应器倾倒的动力来自（）系统。
A、液压
B、氮气
C、热油
D、蒸汽
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选择题
I saw a woman running towards me in the dark. Before I could recognize who she was, she had run back in the direction-______ she had come.
A. of which
B. by which
C. in which
D. from which
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