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【单选题】
我国的标准可分四级分别是( )、行业标准(如机械行业JB、国家计量局标准JJG等)、地方标准(DB)和企业标准(QB)。A.
国家标准（GB)、
B.
国家标准（TB)、
C.
国家标准（CB)、
D.
国家标准（AB)、
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