药学综合知识与技能

单选题Reduce 50g to No. 180 powder and determine the loss on drying by drying 2g to constant weight at 100℃ to 105℃。在上述药品的干燥失重实验中,将多少克的待测样品干燥至恒重(  )。

A.50g
B.180g
C.2g
D.100g
E.105g

参考答案:C进入在线模考
暂无解析

你可能感兴趣的试题

1Place the plate in a chamber containing ammonia vapour.此句的意思是将层析板(  )。

A.置于密室中
B.喷氨水溶液
C.置于氨水溶液中
D.置于含氨蒸气的密闭容器中
E.以上都不对

2Cinnamon oil should be kept in a well-filled, well-closed container, protected from light and stored at a tmperature not exceeding 25℃。关于该品的贮藏,下列正确的是(  )。

A.容器大小要适中
B.容器应为棕色
C.应绝对密封保存
D.贮藏温度应在25左右
E.应盖紧避光贮藏

3Use 20g and distil at a rate Of 2.5ml to 3.5ml per minute for 5 hours.实验中蒸馏提取的速率是(  )。

A.每5小时2.5~3.5ml
B.每小时2.5~3.5ml
C.每5小时12.5~17.5ml
D.每小时150~210ml
E.以上均不对