没背板不合格
Not qualified without backboard
以上为机器翻译结果,长、整句建议使用 人工翻译 。
而且还要检查一下镜子后部水银处是否有内衬纸和背板,因为没有背板就是不合格的,而且没纸也不行,这样是会把水银磨掉。
But also to check whether the mercury mirror rear inner liner and a backplane, because there is no backplane is unqualified, and no paper is not good, so is the mercury will wear off.
youdao
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