吸附塔床层充液管线连接在（）管线上。
A.吸附塔底循环泵入口
B.吸附塔底循环泵出口
C.床层
D.抽出液
参考答案：A
Later in this chapter cases will be introduced to readers _____ consumer complaints have led to changes in the law.
A．where
B．when
C．who
D．whose
“近朱者赤，近墨者黑”生动的说明了环境对品德形成的重要影响。
