【单选题】
电子线路的检修中直观法的原理是______。
①
直观法是通过人的眼睛或其它感觉器官去发现故障、排除故障的一种检修方法。
②
直观法是通过人的眼睛或其它感觉器官去发现故障的一种检修方法。
③
直观法是通过人的眼睛或利用万用表欧姆档测量电气的集成电路来判断故障的一种检修方法。
④
直观法是通利用万用表欧姆档测量电气的集成电路一级各元器件自身的电阻值来判断故障的一种检修方法。
【单选题】
已知四点A(10、20、30)、B(30、20、10)、C(10、20、10)、D(20、20、30),则对H面的重影点为______。
①
Normal
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7.8 磅
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EN-US
ZH-CN
X-NONE
A与D,D点可见
②
Normal
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7.8 磅
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2
false
false
false
EN-US
ZH-CN
X-NONE
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③
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A与C,A点可见
④
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A与C,C点可见
【单选题】
A点坐标为(10、20、30),B点坐标为(30、20、30)则AB距离为______。
①
Normal
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7.8 磅
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2
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EN-US
ZH-CN
X-NONE
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正垂线
②
Normal
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侧垂线
③
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正平线
④
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铅垂线