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【单选题】
万用表可以用来测量电流、电压、电阻等,也可以检测各种装置的电器故障,比如 : 检测熔丝,测量墙上插座的电压值,检测房顶上的天线,查明墙上的开关是否有了毛病,并完成许多其他家用电器的检修工作。A.
With a multimeter, we can measure current, voltage ， resistance, etc. And we can also trouble-shoot appliances, test fuses, measure voltage at a wall outlet, check the wires from your roof antenna, find out whether a wall switch is broken, and perform dozens of other household jobs*. In troubleshooting, voltage can be measured while the set is on, and resistance can be measured while the set is off.
B.
With a multimeter, we can measure current, voltage ， resistance, etc. And we can also trouble-shoot appliances, test fuses, measure voltage at a wall outlet, In troubleshooting, voltage can be measured while the set is on, and resistance can be measured while the set is off.
C.
With a multimeter, we can measure current, voltage ， resistance, etc. And we can also trouble-shoot appliances, test fuses, measure voltage at a wall outlet, check the wires from your roof antenna, find out whether a wall switch is broken, and perform dozens of other household jobs
D.
With a multimeter, we can measure current, voltage ， resistance, etc. And we can also trouble-shoot appliances, test fuses, measure voltage at a wall outlet, check the wires from your roof antenna, find out whether a wall switch is broken, You get clues to the location of the trouble by comparing your multimeter readings with the normal values given in service manuals.
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【单选题】下列对口颌系统肌链描述不正确的是
A.
包括水平肌链、环形肌链和姿态肌链
B.
水平肌链是由口轮匝肌、颊肌、咽上缩肌组成
C.
垂直肌链由软腭肌组成
D.
姿态肌链是由项部肌肉通过帽状筋膜连接颞肌、咬肌和舌骨上下肌群组成
E.
以上均不正确
【简答题】PLC 控制与电气控制的差异是什么?
【简答题】PLC 控制与电气控制的差异是什么?
【简答题】PLC 控制与电气控制的差异是什么?
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