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This means that on their DC voltage ranges they have a very high resistance of 10 MW or more, usually 100 MW, and they are very unlikely to affect the circuit under test.
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An analogue meter can be safely connected in reverse, but the digital meters may be damaged.
Connect the meter, making sure the leads are the correct way round.
Always disconnect the multimeter before adjusting the range switch.
1、USB是一种高速的可以连接多个设备的I/O接口，现在已经在PC中普遍使用。下列关于USB的叙述，正确的是（）。
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