问题
不定项选择
关于电子秤中应变式力传感器的说法正确的是[ ]
A．应变片多用半导体材料制成
B．当应变片的表面拉伸时，其电阻变小；反之变大
C．传感器输出的是应变片上的电压
D．外力越大，输出的电压差值越小
答案
答案：A
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关于电子秤中应变式力传感器的说法正确的是[ ]
A．应变片多用半导体材料制成
B．当应变片的表面拉伸时，其电阻变小；反之变大
C．传感器输出的是应变片上的电压
D．外力越大，输出的电压差值越小
答案：A
阅读短文，从A-G七个句子中选择正确选项还原到短文中，使短文内容完整、正确。
Bill started the “football OK!” website two years ago, and now more than 20,000 people visit it every day. 小题2:____ He usually gets up at six and looks at his e-mails. Then he goes to school from nine to fourteen. In the evenings, he always works for about four hours on his website. 小题3:____ “At the moment I am thinking about a new website on American football, maybe for next year,” he said. And is Bill the same person that he was three years ago? 小题4: ____ “I have met a lot of interesting people on the website and I have traveled all over the world.” Bill doesn’t know about the future. “Maybe I will sell the website, I really don’t know. I will just wait and see.” When he is 21, Bill will be a millionaire (百万富翁). 小题5: ____ |