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问题 单项选择题

根据我国《合同法》的规定，被撤销的合同没有法律约束力的起始时间是( )

A．当事人订立合同时

B．当事人向人民法院提出申请时

C．人民法院受理当事人申请时

D．合同被撤销时

答案

参考答案：A

解析： 《合同法》规定，合同被撤销的，自始(合同订立之日)不受法律保护。

单项选择题

三相全控桥接大电感负载时输出电流的波形是（）。

A、正弦波

B、断续波

C、连续近似直线

D、近似矩形波
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单项选择题

In fall 2006, the National Basketball Association (NBA) started using basketballs made with synthetic, or man-made, material instead of leather. They made the change because they wanted every basketball they use to feel and bounce the same. Not all leather balls are exactly alike in weight or how they bounce, but the synthetic balls are.
However, some players complained right away that the new balls bounced differently and were actually harder to control than the leather ones.
Physics helped answer questions about why the new balls felt different. For example, the scientists studied friction, which in this case affects the ability of a player to hold onto a ball. "The greater the friction, the better it will stick to his hand," explains a scientist.
Tests on both wet and dry balls showed that while the synthetic ball was easier to hold onto when dry, it had less friction and became much harder to hold onto when wet. That’s because sweat stays on the surface of the synthetic balls but gets taken into the leather balls.
The scientists also tested bounce and found that the logo printed on the new balls made their surface uneven and caused them to bounce a little strangely compared with the leather balls.
In January, the NBA went back to using the leather balls. They aren’t perfect, but for now, that’s just the way the ball bounces.

The underlined word "They" in the last paragraph refers to ______.

A．the synthetic balls

B．the leather balls

C．the ball players

D．the scientists
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