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【单选题】某污水处理站采用二级处理工艺，进水量10000t/d，COD浓度为1500mg/L，一级COD去除率为80%，二级COD去除率为70%，则该污水处理站外排COD是（ ）
A.
0.45t/d
B.
0.90t/d
C.
1.80t/d
D.
3.75t/d
【单选题】Passage Two Questions 66 to 70 are based on the following passage: If an agreement signed in Germany works out, travelers of this Asian city may one day be able to move from the downtown area to its n...
A.
It is difficult to see fingerprints with human eyes.
B.
There are special ways to recover a suspect’s fingerprints.
C.
Even a small part of a fingerprint is useful for identification
D.
Suspects usually try to avoid leaving their fingerprints at the scene.
【单选题】有时这个民族的某个或某些成员会酿出某些独特的心理, 往往由于禁忌、孤立等社会力量的威慑, 迅速销声匿迹, 陷于孤芳自赏, 很难挤进民族的共同圈子里去,除非有了变化着的共同生活做后盾。
A.
即使 也 不是 便是 而
B.
即便 却 不是 而是 而
C.
即使 却 不是 而是 却
D.
即便 也 不是 便是 却