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【单选题】
称取己酸孕酮0.0105g,加无水乙醇溶解并稀释至10mL,摇匀,精密吸取1mL,置100mL容量瓶中,加无水乙醇稀释至刻度,置1cm吸收,于240nm处测定吸收度,已知己酸孕酮的=393,测得样品液吸收度A=0.399,按干燥品(干燥失重0.5%)计算己酸孕酮百分含量。( )1%1cmEA.
97.2%
B.
96.7%
C.
98.5%
D.
101.8%
E.
97%
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举一反三
【单选题】– What did he say just now? ––He asked me ________ in Jinhua.
A.
when did the Trade Fair open
B.
when the Trade Fair open
C.
when the Trade Fair opened
D.
when does the Trade Fair open
【单选题】How did Christopher Columbus discover the Americas?
A.
He was commissioned by the King and Queen of Spain to find an alternative trade rout to India.
B.
He was commissioned by the Italian King to locate suitable lands for new colonies.
C.
He was commissioned by the British to establish a new tea trade route with India.
D.
He was evading pirates as he navigated the Atlantic when he accidentally discovered the West Indies.
【简答题】计算机的硬件可分为哪些类型,每种类型请具体化展开说明,务求全面。
【单选题】When Katniss began gathering food, where did she begin to trade her supplies? Her father’s connections at this place helped her to trade easily.
A.
The mayor’s office
B.
The Capitol
C.
The meadow
D.
The Hob
【单选题】When did the man start to study art?
A.
When he was in high school.
B.
After he went to a trade school.
C.
After he became a junior in college.
D.
After he became a senior in college.
【单选题】—What did Kate say just now? —She asked _________.
A.
who has been to the USA in our class
B.
what was wrong with my computer
C.
when did China become a member of the World Trade Organization
D.
that China had successfully held the Olympic Games
【单选题】患者女,45岁。行宫颈癌根治术后第12天。护士在拔尿管前开始夹闭尿管,定期开放,以训练膀胱功能。开放尿管的时间为
A.
每5小时1次
B.
每2小时1次
C.
每3小时1次
D.
每4小时1次
E.
每1小时1次
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