During the construction process, if there is an object falling or hitting, it should be used ____________ .

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The following ____________ is correct 1A fixed valve-regulated sealed lead-acid battery 2VMonomer, the rated capacity is 800Ah.

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The leakage protector is mainly divided into electronic type and electromagnetic type according to the action mode.

• A.True
• B.False

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International Electrotechnical Commission ____________. The specified contact voltage limit is
____________V, And stipulate 25V. The following does not need to consider the prevention Safety measures to prevent electric shock.

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