假设某电视机厂生产过程中遇到这样三种情况①该厂率先提高劳动生

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假设某电视机厂生产过程中遇到这样三种情况　
①该厂率先提高劳动生产率，该行业劳动生产率不变
②该行业劳动生产率普遍提高，该厂劳动生产率未变
③该厂与该行业劳动生产率同时提高
在上述三种情况下，该厂生产的每台电视机的价值量的变化依次是

A．提高不变降低	B．不变降低降低
C．不变不变提高	D．降低提高不变

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