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绿色包装策略是指包装材料使用可再生、再循环材料，包装 废弃物容易被处理及对生态环境有益的包装。
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A multimeter is an electronic measuring instrument that combines several measurement functions in one unit. A typical multimeter may include features such as the ability to measure voltage, current and ().
The central knob of digital multimeter has several positions. To measure small current, set the multimeter to (). To measure large current, set the multimeter to 20A.
The resistance of a light sensor in bright light is () that in the dark.
To measure current, the circuit must be broken to allow the meter to be connected in series. To measure (), the circuit is not changed, the meter is connected in parallel. To measure resistance, the component must be removed from the circuit.
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