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This is safeguarded by a safety door and a safety switching contact.
这一点的安保是由安全门和安全开关触头来实现的。
youdao
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Contact life is much longer when cold switching is used.
当采用冷切换时，触点的寿命要长许多。
youdao
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Contact life is much longer when cold switching is used.
当采用冷切换时，触点的寿命要长许多。
youdao