【简答题】用所给词的适当形式填空。 1. My sister is a _____________ (dance), she _____________ well. 2. Does the woman _____________ (do) some _____________ (clean) in the evening? 3. The old men work on a farm , they are _...
【简答题】用所给动词的适当形式填空。 1. They enjoy _____ (dance) and dance for 2 hours every day. 2. We _____ (not do) homework at the weekend. 3. Could you tell me how _____ (get) there on foot? 4. Tom with his brothers __...
【多选题】下列四环素类药物化学性质的叙述正确的是哪些
A.
在酸性条件下,C6-OH易脱水形成脱水化合物
E.
C4位上的二甲氨基在pH 2~6条件下,可发生差向异构化反应
【简答题】根据句意,用所给词的适当形式填空。 1. He found many people ______________ (dance) there. 2. My idea is quite different from ____________ (she). 3. Pop music is ____________ (live) and good to dance to. 4. Sally is a c...
【单选题】在PH2-6的条件下,可发生差向异构的药物是
【多选题】下列四环素类药物的性质叙述正确的是
C.
C4位上的二甲氨基在pH2-6条件下,可发生差向异构化反应