皮皮学，免费搜题
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【单选题】
脱丁烷塔中,要求塔顶流出物中异戊烷含量不高于1%(质量),塔釜产品中正丁烷含量不高于3%(质量),则其中轻分为:A.
异丁烷
B.
正丁烷
C.
正戊烷
D.
异戊烷
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举一反三
【简答题】A．By different gestures. B．By different voices. C．By different colors. D．By different costumes.
【单选题】They all have _______. [ ]
A.
the different ideas
B.
different ideas
C.
the different idea
D.
different idea
【单选题】A single barometric pressure reading of 28.60 indicates ______.
A.
rapidly improving weather
B.
deteriorating weather
C.
a severe low pressure system
D.
fair weather and calm
【单选题】Last summer we visited the Weat Lake,______ Hangzhou is famouse in the world.
A.
for which
B.
for that
C.
in which
D.
what
相关题目：
【简答题】A．By different gestures. B．By different voices. C．By different colors. D．By different costumes.