He had a good time on New Years Eve.
A. True.
B. False.
用于控制不合格率、废品率、交货延迟率、缺勤率、邮电、铁道部门的各种差错率的控制图是()。
A. c控制图
B. u控制图
C. p控制图
D. np控制图
Which of the following is a convertible security？______.
A kind of equity convertible into a bond.
B. A bond secured on assets which may be converted into other, better quality assets.
C. A bond which can be converted on pre-fixed terms into equity.
D. A fixed-rate bond that continues to exist after its option to buy shares has been exercised.
用pH梯度萃取法分离，5%.NaHCO3，萃取层可分离得到的是E．
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