问题
单项选择题
精密称取苯巴比妥0.1901g，依法用硝酸银滴定液(0.1008mol／L)滴定，消耗8.0lml，每1ml硝酸银滴定液(0.1mol／L)相当于23.22mg的苯巴比妥，计算含量（）
A.99.8％
B.94.4％
C.97.8％
D.100.2％
E.98.6％
答案
参考答案：E
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精密称取苯巴比妥0.1901g，依法用硝酸银滴定液(0.1008mol／L)滴定，消耗8.0lml，每1ml硝酸银滴定液(0.1mol／L)相当于23.22mg的苯巴比妥，计算含量（）
A.99.8％
B.94.4％
C.97.8％
D.100.2％
E.98.6％
参考答案：E
| The number 3, 289, 030 can be read as ______. |
A. three millions, two hundred and eighty-nine thousand thirty B. three millions, two hundred and eight nine thousand and thirty C. three million, two hundred and eighty-nine thousand, and thirty D. three million, two hundreds and eighty-nine thousand and thirty |