A:化学偶联假说
B:构象变化偶联假说
C:化学渗透假说
D:诱导契合假说
春节放爆竹和礼花时,若你在一旁观看,为保护鼓膜不受损伤,下列做法中正确的是( )
①张开嘴 ②张开嘴并捂住耳朵 ③闭上嘴 ④闭上嘴并捂住耳朵.
If you have a chance to study abroad, you must catch it and remember “Change always ______ about new possibilities. ”