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【单选题】
为了防止树脂污染，要求进NA交换器的原水悬浮物含量（）
A.
≤20mg/L
B.
≤10mg/L
C.
≤5mg/L
D.
≤3mg/L
参考答案：
参考解析：
刷刷题刷刷变学霸
举一反三
【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.