【单选题】【消耗次数：1】
在露天、潮湿场所或金属构架上操作时，必须选用Ⅱ类手持式电动工具，并装设漏电保护器，严禁使用（）手持式电动工具。
①
Ⅰ类
②
Ⅱ类
③
Ⅲ类
④
Ⅳ类
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written
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writing
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write
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wrote
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employ as many learning strategies as possible
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expect to gain an easier task
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exert oneself constantly
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either
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or
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nor
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so
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As if
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Even though
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In addition
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whenever
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only if
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lives far away from you
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recognize them
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nod at them
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concentrate much on them
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practice using them constantly