对于Ⅱ类工业固体废物的填埋场要求天然基础层的渗透系数不应大于( )cm/s。
A．10-5
B．10-6
C．10-7
D．10-10
参考答案：C
Although Jane agrees with me on most points, there was one on which she was unwilling to _______.
A．give out
B．give in
C．give away
D．give off
安全阀和压力表校验后必须加铅封，（）的不可使用。
