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【简答题】
由于地球内部和外部的动力学因素，地球极点在地球表面上的位置随时间而变化，这种现象叫（）。随时间而变化的极点叫瞬时极，某一时期瞬时极的平均位置叫平地极，简称（）。
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皮皮学刷刷变学霸
举一反三
【单选题】It can be inferred from the last paragraph that_____.
A.
parents who have babies should be banned from smoking
B.
less smokers regard smoking harmful than nonsmokers do
C.
researchers fail to prove the harm of third-hand smoke now
D.
second-hand smoke does more harm than third-hand smoke
【单选题】若脊髓颈膨大节段的蛋白质前联合损伤,患者会出现
A.
右侧躯干和下肢痛、温觉丧失
B.
左侧躯干和下肢痛、温觉丧失
C.
两侧躯干和上肢痛、温觉丧失
D.
主要是两侧上肢痛、温觉丧失
E.
以上都不对
【简答题】以下哪个不属于钢筋常见的连接方式? ( B ) A 、 绑扎搭接 B 、铆钉连接 C 、焊接 D 、机械连接
【单选题】Parents should pay attention to the cases _______ their children have difficulty adapting to new surroundings.
A.
where
B.
as
C.
why
D.
when
【单选题】Most families in China now have only one child. Parents should teach their children _____ others when they are young. [ ]
A.
what to play with
B.
when to get on with
C.
which to play with
D.
how to get on with
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