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【简答题】
某天然油脂的化学式为C 57 H 106 O 6 。1mol该油脂水解可得到1mol甘油、1mol不饱和脂肪酸B和2mol直链饱和脂肪酸C。经测定B的相对分子质量为280，原子个数比为C:H:O=9:16:1。 (1)写出B的分子式：____________。 (2)写出C的结构：_____________ ；C的名称是___________。 (3)写出含5个碳原子的C同系物的同分异构体的结构：________ ；________。
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举一反三
【单选题】With the price of houses , many people in big cities can’t afford to buy a house.
A.
gone up
B.
goes up
C.
going up
D.
being gone up
【单选题】The price of houses doubled last year. However, the increase has been ___________ small this year.
A.
extensive
B.
relatively
C.
in advance
D.
depend on
【单选题】Nowadays the price of houses is than before.
A.
very low
B.
much cheaper
C.
a lot higher
D.
more expensive
【单选题】价值工程中的“成本”，是指一个产品从构思、设计、制造、流通、使用直到报废为止的整个时期所需的全部费用，称之为( )
A.
使用和维修成本
B.
生产成本
C.
寿命周期成本
D.
使用成本
【简答题】The price of houses doubled last year. However, the increase has been ____ (relative) small this year.
【单选题】The price of houses goes up again, partly _______the requirement of young people.
A.
in result of
B.
with
C.
because
D.
due to
【简答题】根据第一个句子的意思，完成第二个句子，每个空格只准填一个单词。 1. The newspaper says the price of houses will continue to rise. It _______ _______ that the price of houses will continue to _______ _______. 2. We don't have to leave...
【单选题】Experts believe that it will be five or six years ______ the price of houses becomes acceptable for ordinary families. [ ]
A.
since
B.
after
C.
before
D.
until
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