• 2022-05-31
    当接近正在运行的发动机时,必须使用听力防护设备。
    A: You must use ear protection when you are near an engine that is in operation.
    B: You are entailed using ear protection when you are near an engine that is in operation.
    C: It's essential to use ear protection when you are near an engine that is in operation.
    D: You have to use ear protection when you are near an engine that is in operation.
  • A

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