国家标准《高纯氮》,气态氮和液态氮合格品氮的纯度为不小于99.9%。
参考答案:错
(2013·江西赣州高三一模)The meeting which is reported ________ this month has been put off till the end of next month.
A.being held
B.to hold
C.to be held
D.holding
末梢血反映骨髓红细胞增生程度的准确指标是
A.血红蛋白量
B.网织红细胞百分数
C.红细胞计数
D.红细胞平均体积
E.网织红细胞绝对值