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【单选题】
细胞壁内填充和附加木质素,可使细胞壁的硬度及其机械力增加。这种细胞壁特化的美型称为()A.
木栓化
B.
角质化
C.
木质化
D.
矿质化
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举一反三
【单选题】If people weren't prepared to experiment with new teaching method, thing would never change.
A.
campaign
B.
swerve
C.
endeavor
D.
manipulate
【单选题】In Para. 7, the sentence “If they are forgotten or squeezed in at the last minute...” means “______.” A) if people forget to do them or try to do them among many other things at the last minute... B) ...
A.
if people forget to do them or try to do them among many other things at the last minute...
B.
if people forget to go to a place it may be very crowded at the last minute...
C.
if there are changes in the shape or size of things left to the last minute...
D.
if things are forgotten and not put into a safe place at the last minute...
【简答题】共混物性能的影响因素有哪些？
【简答题】A．If people had more time to learn how to do it. B．If its cost went down. C．If it could make buildings more attractive. D．If people realized its many advantages.
【单选题】若一个关系模式的所有属性都是不可再分的基本数据项,则称为第一范式。在任何一个关系数据库系统中,所有的关系模式必须满足第一范式。不满足第一范式要求的数据库模式就不能称为关系数据库模式。以下不是关系模型的最低要求的是:、
A.
两个含义重复的属性不能同时存在于一个表中
B.
一个表中的一列不能是其他列的计算结果
C.
一个表中不能有重复的行
D.
一个表中某一列的取值不能有多个含义
【单选题】If people succeed in building muscles they will look _____.
A.
If people succeed in building muscles they will look _____.
B.
thinner
C.
lighter
D.
denser
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