问题
单项选择题
为了提高探头灵敏度，点探头绕组是绕于（）。
A.矽钢片上
B.铁**氧磁心上
C.塑料上
D.不锈钢上
答案
参考答案：B
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为了提高探头灵敏度，点探头绕组是绕于（）。
A.矽钢片上
B.铁**氧磁心上
C.塑料上
D.不锈钢上
参考答案：B
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| "Eyes are windows of the soul." Everyone knows the 1 of the eyes. 2 more and more students are becoming near-sighted (近视). So how to protect the eyes is still a serious problem. Here is some advice on 3 protect your eyesight (视力). You should not keep your eyes 4 for a long time. When reading, you should keep the books about a foot away from you. After reading for an hour 5 two, you'd better have a 6 by looking into the distance (远处). You must remember not to read in dark light or in 7 , not to read on a moving bus or in bed. Doing eye exercises will help 8 to protect your eyesight. In a 9 , to keep 10 eyesight, we must have good studying habits. | |||
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