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乙醇的工业制法 :粮食发酵法和乙烯水化法 1. 发酵法 淀粉 → 葡萄糖 → C 2 H 5 OH 发酵液中乙醇的质量分数约为 6% ~ 10 %,经精馏可得 95% 的工业乙醇。含乙醇 以上的叫无水酒精。用工业酒精与 混合,再经 的方法得到无水乙醇。 2 .乙烯水化法 CH 2 = CH 2 + H 2 O → C 2 H 5 OH所用的乙烯可以大量来自于石油的裂解。 3 . 乙醇 用作 、 、 ;常用的溶剂; 的乙醇溶液用于医疗消毒。
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【单选题】You can’t help______commercials every few minutes a program is interrupted to broadcast one advertisement or another.
A.
to see
B.
see
C.
seeing
D.
with seeing
【单选题】The sunspot came into its active stage last year, that happens once every eleven years.
A.
one
B.
it
C.
the one
D.
what
【单选题】The Olympics are like a huge stage ________ everyone makes every effort to achieve their dreams.
A.
that
B.
when
C.
which
D.
where
【单选题】The sunspot came into its active stage, __________ that happens once every eleven years.
A.
one
B.
it
C.
the one
D.
what
【简答题】Do you know there is an earthquake every thirty seconds in the world? But don’t worry because most of them are so small that they cannot be felt. Only a few hurt people. Many earthquakes happen in Chi...
【简答题】______________is required for every stage and at every level in the supply chain.
【单选题】By upsetting the balance of the climax stage, man will ______ the indiscriminate hunting of whales for food.
A.
encourage
B.
support
C.
reduce
D.
prohibit
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