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【单选题】

What can we learn about Betsy Ross from the article?

A.
She was born in a rich family.
B.
She was very good at needlework.
C.
She was forced to sell caps to help support her family.
D.
She and her husband opened a shop after the Revolutionary War ended.
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参考解析:
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【单选题】若闪光器频率失常,则会导致( )。

A.
左转向灯闪光频率不正常
B.
右转向灯闪光频率不正常
C.
左右转向灯闪光频率均不正常
D.
转向灯不亮

【单选题】施工现场内所有防雷装置的冲击接地电阻值( )。

A.
不得大于4Ω
B.
不得大于10Ω
C.
不得大于30Ω
D.
不得大于50Ω

【单选题】偶然性在事物发展过程中

A.
起非从属性作用
B.
有时不起作用
C.
起促进或延缓的作用
D.
起决定性的支配作用