How can it pass the pre - installation self test?

能通过安装前的测试 吗 ?

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Service all LSG and CDG instruments such as pre - installation, warranty follow up etc.

维修所有LSG和CDG仪器,例如:预安装, 保修等等.

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Pre - installation of high pressure gas can be used in addition to blowing dust.

安装前可用高压气体吹除灰尘.

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