【判断题】【消耗次数：1】
电气原理图中主电路用粗实线，控制电路和辅助的信号指示及保护电路用细实线。
①
正确
②
错误
参考答案：
复制
纠错
相关题目
【单选题】
化工制图中图线宽度分粗、中粗、细三种，若粗实线的宽度为d，则细实线的宽度为( )。
①
Normal
0
7.8 磅
0
2
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false
false
EN-US
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2d
②
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d
③
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1/2d
④
Normal
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1/4d
随机题目
【单选题】
设*为集合 S上可交换、可结合的二元运算, 若 a, b 是 S 上关于*运算的幂等元，则可以推断a*b 是：
①
幂等元；
②
不一定是幂等元；
③
幺元；
④
自逆元。
【单选题】
设格中元素a,b,c,d，若a ≤ b和c ≤ d，下面哪个性质不满足：
①
a*c ≤ b*d；
②
a?c ≤ b?d；
③
a*c ≤ b?d；
④
a?c ≤ b*d。