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【单选题】
关于向心力的下列说法中正确的是 A .向心力不改变做圆周运动物体速度的大小 B .做匀速圆周运动的物体,其向心力是不变的 C .做圆周运动的物体,所受合力一定等于向心力 D .做匀速圆周运动的物体,所受的合力为零A.
B.
C.
D.
D
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举一反三
【多选题】Which of the letters are for adopting putonghua as a unified language in China?
A.
Letter A
B.
Letter B
C.
Letter C
D.
Letter D
【简答题】China is unified in Qin ______ (王朝).
【单选题】China's unified writing system forms a strong bridge linking ________.
A.
China with the rest of the world
B.
Asia, Africa, and Europe
C.
the present and the past
【简答题】阅读理解：根据文章内容，完成选择题。 CHINA CALLS FOR UNIFIED INTERNATIONAL RULES AGAINST INTERNET CRIME Cyber security has always been a serious issue as the internet industry is ever growing. Nowadays, people can easi...
【单选题】短文理解 听力原文： The Chinese currency is the Renminbi. China has maintained a unified managed floating exchange rate since January 1994. The exchange rate of the Renminbi is determined by the inter-bank for...
A.
1992
B.
1993
C.
1994
D.
1995
【单选题】Which are against adopting putonghua as a unified language in China?
A.
Letter A
B.
Letter B
C.
Letter C
D.
Letter D
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