埋地、嵌墙暗敷设的管道，应在（）合格后再进行隐蔽工程验收。
A.管道连接
B.水冲洗
C.水压试验
D.保温
参考答案：C
杂质检查所用的试剂为
重金属的检查
A．稀盐酸 B．锌粒 C．稀硫酸 D．甲基红指示液 E．醋酸盐缓冲液(pH3.5)
It is usually warm in my hometown in March, but it _____ be rather cold sometimes.[ ]
A. must
B. can
C. should
D. would
