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【多选题】
双子叶植物根与单子叶植物根组织结构最大区别是A.
的有无
B.
形成层的有无
C.
皮层的有无
D.
髓部的有无
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举一反三
【单选题】尼龙-66的平均分子量是1.8万,以结构单元表示的聚合度是(已知:尼龙-663 重复单元的分子量是226)
A.
7 96
B.
1 59
C.
9 000
D.
1 8000
【简答题】己内酰胺以NaOH作引发剂制备尼龙-6 的聚合机理是 ;尼龙66的重复单元是 。
【简答题】Coal is a very popular form of energy. ____________________
【单选题】The reason why coal is still a very valuable source of power is ______atomic power is not available in sufficient quantity.
A.
because
B.
that
C.
as
D.
for
【单选题】________ earthquake in Japan on March 11th, 2011 is ________ great shock not only to the Japanese people but also to people all over the world. [ ]
A.
The; the
B.
The; a
C.
An; a
D.
An; the
【单选题】“平衡三联”是指:( )
A.
恶心、耳鸣和眩晕
B.
前庭、视觉及本体感觉3个系统
C.
半规管、椭圆束、球囊及耳蜗
D.
水平眼震、旋转眼震和垂直眼震
E.
上述都不是
【简答题】尼龙66的重复单元是（）。
【单选题】Usually you will not get a shock by touching the electric ray in one place only because ______.
A.
the current in one place is not strong enough to give a shock
B.
the fish's electric cells are filled with jelly like substance
C.
to complete the circuit, you have to touch the fish in two places
D.
a torpedo's electric cells contain more than one electric plates
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