问题
单项选择题
液体在固体表面的润湿程度，常以接触角θ大小来表示。当0°<θ<90°时表示
A．固体表面被液体完全润湿
B．固体表面能被液体润湿
C．固体表面难以被液体润湿
D．固体表面完全不被液体润湿
E．液体内部的化学键力产生表面张力
答案
参考答案：B
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液体在固体表面的润湿程度，常以接触角θ大小来表示。当0°<θ<90°时表示
A．固体表面被液体完全润湿
B．固体表面能被液体润湿
C．固体表面难以被液体润湿
D．固体表面完全不被液体润湿
E．液体内部的化学键力产生表面张力
参考答案：B
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| John,11 years old, was in bed in hospital. Several days before, while he was 1 in a baseball game, he fell and hit his head. The doctors believed that he might 2 get well. "He seems to have given up hope. So medicines alone won't 3 . Perhaps he needs something else," said a doctor. "When I visit him, all he ever says is that he would like to meet Babe Ruth." To meet Babe Ruth, of course, was not 4 . In America, Babe Ruth was as 5 a man as the President himself, and he was the most famous baseball player. The next day John's father managed to tell Babe Ruth about the story of his son on the phone. Twenty-four hours later, as the boy 6 in his hospital room, in walked 7 . Young John could hardly believe his own eyes! The great baseball player sat down at Jobn's bedside, sang, "Now, listen, kid, you've got to get well. I've brought you a new American League baseball, 8 you must start throwing it." For John this was the beginning of a new life. 9 his doctors' surprise, the boy walked out of the hospital on his own a few weeks later. How was able to live a healthy life-all because of the 10 of Babe Ruth. | ||||
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