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问题
单项选择题
在室内给排水管道工程量计算规则中，地面清扫口、（）按DN计。
A、坐便器
B、洗脸盆
C、浴盆
D、水嘴、地漏
答案
参考答案：D
选择题
The _____ look on his face suggested that he hadn't expected _____ would happen.
A. surprised; what
B. surprising; what
C. surprised; that
D. surprising; that
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判断题
污水处理系统中投加的甲醇药剂的作用是调节pH值
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