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【多选题】
桥上CRTSII型双块式无砟轨道的主要特点是()。A.
道床板采用分块结构
B.
设置伸缩缝
C.
道床板下设抗剪凸点限位
D.
梁面保护层设2%横向排水坡，桥面三向排水
E.
不设置伸缩缝
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【单选题】It is often said that _____ teachers have _____ very simple life .
A.
/ , /
B.
/ , a
C.
the , /
D.
the , a
【单选题】. So before I go any further I want to thank you very much for inviting me to __________ this important conference.
A.
participate in
B.
join to
C.
take part
D.
attend to
【简答题】单词拼写。 1.It's very cold today;the temperature has dropped to the point. 2.The Chinese of the English novel appeared in the early 1950s. 3.This island is only by boat. 4.He doesn't like eating the veget...
【单选题】在自然界中只有由多种食物构成的膳食，营养素才会种类齐全、 ( )、且比例适宜，才利于人体吸收利用；被称为平衡膳食。
A.
数量充足
B.
数量有限
C.
数量多少
D.
数量不足
【单选题】I Believe I Can Fly is a nice song by R. Kelly. This song tells us that believing in is very important.
A.
themselves
B.
ourselves
C.
itself
【单选题】在自然界中只有由多种食物构成的膳食，营养素才会种类齐全、数量充足、且( )，才利于人体吸收利用，被称为平衡膳食。
A.
价格偏高
B.
比例适宜
C.
口味多样
D.
有一定的糖分
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