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问题 选择题

在5张卡片上分别写着数字1、2、3、4、5，然后把它们混合，再任意排成一行，则得到的五位数能被5或2整除的概率是（　　）

A．0.8

B．0.6

C．0.4

D．0.2

答案

5张卡片上分别写着数字1、2、3、4、5，然后把它们混合，再任意排成一行，得到的五位数的总数是A55=120

五位数能被5或2整除的特征是个位数排2，4，5三个数，其排法种数是C31×A44=72

故所得五位数能被5或2整除的概率是

72
120
=0.6

故选B

单项选择题

黑土公司获得一种新型药品制造方法的发明专利权后，发现市场上有大量白云公司制造的该种新型药品出售，遂向法院起诉要求白云公司停止侵权并赔偿损失。依据新修改《专利法》规定，下列哪一说法是错误的？（）

A．所有基层法院均无该案管辖权

B．黑土公司不应当承担被告的药品制造方法与专利方法相同的证明责任

C．白云公司如能证明自己实施的技术属于现有技术，法院应告知白云公司另行提起专利无效宣告程序

D．如侵犯专利权成立，即使没有证据确定损害赔偿数额，黑土公司仍可获得一万元以上100万元以下的赔偿额
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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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