People don't feel the earth's movement because the earth is very large.
查看答案
A.toB.inC.forD.from
A. to
B. in
C. for
D. from
下列各类结构中,伸缩缝间距最大的是()。
A. 排架结构
B. 框架结构
C. 剪力墙结构
D. 挡土墙
A.aB.theirC.ourD.that
A. a
B. their
C. our
D. that
当产量为30时,L是()。
A. 20
B. 15
C. 30
D. 20