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【简答题】
在用有机溶剂(三氯甲烷、乙醚等)从碱水溶液中萃取生物碱时,为加入有机溶剂再碱化较好。
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举一反三
【简答题】Many s don’t get enough sleep because they have too much homework to do, which _______ them up at night． A．makes B．breaks C．turns D．keeps
【单选题】Don't _______ too late. or you will feel tired in class. [ ]
A.
wake up
B.
get up
C.
stay up
D.
stand up
【单选题】Many teens don't get enough sleep because they have too much homework to do, which ________ them up at night.
A.
makes
B.
breaks
C.
turns
D.
keeps
【简答题】LTE系统中,随机接入过程中MSG1是可以重复多次发送的额,最多发送次数取决于( )。
【简答题】为更好发挥胃蛋白酶的助消化作用,通常应与() 同时灌服。
【简答题】Many s don’t get enough sleep because they have too much homework, which _______ them up at night. A．makes B．breaks C．turns D．keeps
【单选题】Many teenagers don't get enough sleep because they have too much homework, which _____ them up at night. [ ]
A.
stays
B.
keeps
C.
makes
D.
remains
【单选题】Don't _________too late, or you'll be tired during daytime.
A.
get up
B.
set up
C.
stay up
D.
show up
【单选题】Don't ____ too late, or you will feel tired in class tomorrow. [ ]
A.
wake up
B.
get up
C.
stand up
D.
stay up
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