You should fit a connector(接头) into a port(端口) correctly and join them with ease.
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iPod playtime might shorten if it’s stored in a place where the temperature is below 0oC.
A. 对
B. 错
You can use a soft and slightly damp cloth with household cleaners to clean your iPod.
A. 对
B. 错
褶皱构造有（ ）两种基本类型：1.倾伏褶曲2.背斜 3.向斜4.平卧褶区
A. 1和2
B. 2和3
C. 3和4
D. 1和4
两侧岩层向外倾斜，中心部分岩层时代较老，两侧岩层依次变新，并且两侧对称出现是（ ）
A. 向斜
B. 背斜
C. 断层
D. 节理
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