【单选题】We all agree that the products of this factory are of better ________.
【单选题】巴比妥类药物与碱共沸,水解释放出氨气,是由于
【单选题】Only the factory ____ yesterday ____ this kind of machines.
A.
did we visit; does it produce
B.
did we visit; produces
D.
we visited; does it produce
【简答题】巴比妥类药物分子结构中含有丙二酰脲基团,其特性反应为
【单选题】This is the factory ________ we visited last Monday.
【单选题】This is the factory ____ we worked a year ago.
【单选题】鉴别巴比妥类药物的硝化反应,主要是利用该类药物结构中的
【单选题】The factory________ we visited yesterday was the one _______ I once worked.