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【多选题】
盐酸氯普鲁卡因的鉴别反应是 ____ 。 盐酸利多卡因的鉴别反应是 ____ 。A.
加 入 三氯化铁试液,显紫堇色
B.
在碳酸钠试液中,与硫酸铜反应,生成蓝紫色配位化合物
C.
与硝酸反应,显棕色
D.
在酸性条件下,和亚硝酸钠与萘酚反应显橙红色 E . 加人三氯化铁试液,生成赭色沉淀
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【简答题】Last night was the last for my eight-year-old son’s soccer team. It was the final quarter. The score was two to one, and my son’s team was in the lead. Parents surrounded the playground, offering...
【简答题】Last night was the last for my eight-year-old son's soccer team. It was the final quarter. The score was two to one, my son's team in the lead. Parents surrounded the playground, offering encoura...
【单选题】I think it's important for children _____ eight hours a night. [ ]
A.
sleep
B.
sleeps
C.
to sleep
D.
sleeping
【单选题】Everyone needs at least eight _________ sleep a night. ——I agree.
A.
hour
B.
hours
C.
hour’s
D.
hours’
【单选题】Everyone ______ to have at least eight ______ sleep at night. [ ]
A.
needs, hour's
B.
need, hours'
C.
needed, hour's
D.
needs, hours'
【简答题】选词填空。 give, get, need, believe, stay 1. I ________ it’s important to sleep eight hours a night. 2. A docto r can ________ you midicine. 3. Don’t ________ stressed out. It’s not healthy. 4. I have a to...
【简答题】Last night was the last for my eight-year-old son’s soccer team. It was the final quarter. The score was two to one, my son’s team in the lead. Parents surrounded the playground, offering encoura...
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