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【简答题】
某检验员对花生仁样品中的粗脂肪含量进行检测,操作如下 j准确称取已干燥恒重的接受瓶质量为45.3857g; k称取粉碎均匀的花生仁3.2656g,用滤纸严密包裹好后,放入抽提筒内; l在已干燥恒重的接受瓶中注入三分之二的无水乙醚,并安装好的装置,在45-50°C左右的水浴中抽提5小时,检查证明抽提完全。 冷却后,将接受瓶取下,并与蒸馏装置连接,水浴蒸馏回收至无乙醚滴出后,取下接收瓶充分挥干乙醚,置于105°C烘箱内干燥2小时,取出冷却至室温称重为46.7588g,第二次同样干燥后称重为46.7020g, 第三次同样干燥后称重为46.7010g,第四次同样干燥后称重为46.7018g。 请根据该检验员的数据计算被检花生仁的粗脂肪含量。
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举一反三
【简答题】按从大到小排列各数。 31，72，24，35，58，96，66，44
【判断题】London dialect began to spread as Standard English in the Middle English period. [2.2.2]
A.
正确
B.
错误
【单选题】Which of the following factors did not contribute to the London dialect becoming standard English?
A.
The court moved from Winchester to London.
B.
The dialect was used by educated people.
C.
The dialect remained unaffected by foreign trade.
D.
The dialect was gradually spoken by more and more people.
【单选题】London dialect was once disseminated throughout the country NOT because London was ——.
A.
a commercial center
B.
a political center
C.
a printing center
D.
a linguistic center
【简答题】竖式计算 62×77= 47×34= 18×90= 35×23= 65×44= 70×36=
【单选题】It was _________ who made London dialect the foundation of the modern English speech.
A.
Chaucer
B.
Shakespeare
C.
Wyatt
D.
Boccaccio
【单选题】The name “the father of English poetry” was given to who was born in London about 1340 and did much in making the dialect of London (Midland dialect the language of the court, the learned and the well...
A.
Shakespeare
B.
Spenser
C.
Philip Sidney
D.
Chaucer
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