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【单选题】

净化剂对悬浮物去除率可达()以上。

A.
90%
B.
85%
C.
80%
D.
75%
题目标签:悬浮净化剂去除
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参考答案:
参考解析:
.
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【多选题】为了去除图像中某一频率分量,除了用带阻滤波器我们还可以用()

A.
低通滤波器
B.
高通滤波器
C.
带通滤波器
D.
低通滤波器和高通滤波器

【单选题】明矾(ALK(SO4)2·12H2O)常用作水的净化剂,是因为()。

A.
溶于水后产生AL3+
B.
溶于水后产生K+
C.
溶于水后形成AL(OH)3胶体
D.
溶于水后生成SO2-4

【单选题】去除旧漆膜不可以使用的打磨机是( )

A.
单作用打磨机
B.
偏心距3mm的双动作打磨机
C.
偏心距7mm的双动作打磨机
D.
偏心距5mm的双动作打磨机

【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.