中涂层施工完毕后，原子灰表面需喷涂中涂（）漆。
A.底
B.面
C.橡胶
D.胶水
参考答案：A
一般油层采出水中硫化物含量都小于（）mg/L。
A.0.5
B.1.0
C.1.5
D.2.0
To become complete mature, a child has to pass through several different stages in development at different times and at different rates of speed．
