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【单选题】
以孕甾烷为基本骨架的是（）A.
螺甾烷醇型甾体皂苷
B.
胆汁酸类
C.
植物甾醇
D.
C 21 甾体化合物
E.
呋甾烷醇型甾体皂苷
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举一反三
【简答题】在烃类热裂解中,从裂解气中脱硫的方法是什么?( 10 分) In thermal cracking (or steam cracking) of hydrocarbon, what methods are used to remove sulfur compounds from cracked gas? (10 points)
【单选题】Choices are made whenever
A.
money is limited.
B.
there are too many alternatives.
C.
resources are limited relative to human wants.
D.
the society has abundant resources.
【单选题】Corcodilos suggests job seekers try to get around the human-resources department whenever possible because ______.
A.
they can ask a headhunter to get to the hiring manager
B.
they may get lost in the shuffle
C.
they may have to wait a long time for an interview
D.
they can use a back channel
【单选题】在利用数组输入公式的方式输完公式时,需要按()键。
A.
Ctrl+Enter
B.
Ctrl+Shift+ Enter
C.
Alt+Enter
D.
Shift+Enter
【简答题】Whenever human populations have lived in forest areas, they have always cut down trees which they used for a number of purposes, for housing and ships and served as a source of heating fuel and timber...
【单选题】Whenever human activity generates a concentration of a substance in the environment sufficient to cause harm to living things, it is called:
A.
a free good.
B.
an external shock.
C.
a result of human greed.
D.
pollution.
【单选题】Corcodilos suggests job seekers try to get around the human-resources department whenever possible because __________________.
A.
t hey can ask a headhunter to get to the hiring manger
B.
t hey may get lost in the shuffle
C.
t hey may have to wait a long time for an interview
D.
t hey can use a back channel
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