一个盒子里装有4个红球、5个黄球、2个黑球（球除颜色外都相同）

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问题填空题

一个盒子里装有4个红球、5个黄球、2个黑球（球除颜色外都相同），从中任取一个球，取到黄球的可能性是______，取到白球的可能性是______．

答案

根据题干分析可得：取出黄球的可能性是：5÷（4+5+2）=

，

因为盒子里面没有白球，所以不可能摸出白球，所以摸出白球的可能性是0．

故答案为：

；0．

完形填空

Mr. Smith lived in a village far away __ 16_ a town . One day he felt very ill and every one 17 he would die . They sent for a doctor . The doctor 18 and looked at the man closely . The doctor asked for a pen and ___19 paper to write down the name of the medicine(药). But there was no pen _20 _ paper because all the villagers never went to school before. The doctor had to use a piece of charcoal to write down the name of the medicine on the door of the house. “Get this medicine for him .” he said , “and he will ___ 21 _ get better .” Mr Smith’s family and friends didn't know _ _22__ to do . They could not read the __ 23_ writing . Then Mr. Smith’s son had an idea . He shut ___24 the door of the house , put it on his back and ran to the nearest town . He bought the medicine , he soon got rid of his __ 25 . He would not let anyone wash the magic words from the door .

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单项选择题

(医疗器械的基本质量特性)

一次性使用输液器

A．有效性和电气安全
B．有效性和生物相容性
C．有效性、无菌和生物相容性
D．电气安全和有效和生物相容性
E．电气安全、有效性、无菌和生物相容性

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