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Internal cleaning work and troubleshooting must be performed by professional personnel.
仪器内部清洁工作及故障修理，必须由专业人员操作。
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The cleaning tube comprises an outer tube and an internal valve.
该冲洗管包括外管和内阀。
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The cleaning tube comprises an outer tube and an internal valve.
该冲洗管包括外管和内阀。
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