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【单选题】
关于微孔滤膜的叙述,错误的是:( )孔隙率高,滤速快A.
截留微粒能力强
B.
不影响药液的pH值
C.
吸附性小，不滞留药液
D.
孔径小，滤速慢
E.
孔径小，易堵塞
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举一反三
【单选题】Lenore Skenazy believes that keeping kids under careful watch
A.
hinders their healthy growth
B.
adds too much to parents’ expenses
C.
shows traditional parental caution
D.
bucks the latest parenting trend
【单选题】Mothers and matchmakers(媒人) have always known that not being married is a definite health hazard. But when a team of researchers from the University of California, San Francisco, reported a few weeks ...
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】The warning message about the Alar apple was given ______.
A.
by Consumers Union
B.
by a health center
C.
through a news agency
D.
through the government
【单选题】Water is the cheapest drink. And it is also ______.
A.
healthier
B.
healthiest
C.
the healthier
D.
the healthiest
【简答题】The author considers it impossible to obtain no-risk food because ________. A) no food is free from pollution in the environment B) pesticides are widely used in agriculture C) many vegetables contain...
【简答题】It was a very foggy day in London. The fog was so thick that it was impossible to see more than a foot or so. Buses, cars and taxis were not able to run and were standing by the side of the road. Peop...
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