周转轮系的转化机构是一定轴轮系。（）
A. 对
B. 错
What kind of medal did Liu Jiayu claim at Pyeongchang Winter Olympics?
A. Gold medal.
B. Silver medal.
C. Bronze medal.
D. No medal.
Which of the following is TRUE?
A. This is the first medal claimed by LiuJiayu.
B. This is the first gold medal claimed by Liu Jaiyu.
C. Liu Jiayu snatched the first medal for China at the Pyeongchang Winter Olympics.
D. Liu Jiayu snatched the first medal for women at the Pyeongchang Winter Olympics.
What happened to her at the 2010 Vancouver Winter Olympics？
A. She claimed a gold medal.
B. She claimed a silver medal.
C. She claimed a bronze medal.
D. She was injured.
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