【单选题】When ______ difficult problems, we should often take an optimistic attitude.
【单选题】IV型超敏反应可经过下列哪一种成分被动转移 。
【单选题】Some customers accuse Toyota ______ being slow to fix the car problems, which makes them disappointed.
【单选题】在 NH 3 的水解平衡 NH 3 (aq) + H 2 O(l) (aq) + OH - (aq) 中,为使 [OH - ] 增大,可行的方法是
【单选题】某抑制剂抑制线粒体中以琥珀酸为底物的复合体III呼吸 , 而这种抑制作用可被解偶联剂所解除 , 这个抑制剂的作用部位是 ()
【单选题】With difficult problems ___, the president feels relaxed now.
【单选题】_____________ many times, the problems were settled at last.
【单选题】在 NH 3 的水解平衡NH 3 + H 2 O ≒ NH 4 + + OH - 中,为使[OH - ] 增大,可行的方法 是 ( )