A good safety practice is to expect that hazardous voltage is present in any unknown circuit before measuring.
一个良好的安全实践是在测量之前假设所有位置电路上都存在危险电压。
When chemical plants first developed, safety and the environment were not usually greatly considered, resulting in air and water pollution, and poor safety practice.
化工厂刚刚出现的时候，对安全和环境问题一般都没有给予足够的重视，因此造成了空气污染、水污染和不安全运作等问题。
When chemical plants first developed, safety and the environment were not usually greatly considered, resulting in air and water pollution, and poor safety practice.
化工厂刚刚出现的时候，对安全和环境问题一般都没有给予足够的重视，因此造成了空气污染、水污染和不安全运作等问题。
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