拆除工作接地线时顺序与挂接地线顺序（）
A.相同
B.相反
C.随意
D.无规律
参考答案：B
He ________ the problem ________ in his mind for a whole week before he did anything about it.
A．switched;on
B．kicked;up
C．turned;over
D．took;on
二级处理过程可以去除大于（）的BOD，及悬浮固体物质。
A．80％
B．85％
C．90％
D．95％
