Business is improving but much more hard work and common sense will be _____ before any profits can be realized. A. put up with B. called for C. gone through
—Mary told me she would﹍﹍computer studies. —Really? I’ll try my best to ask her to﹍﹍such foolish ideas. A. pick up; give up B. put away; give up C. give up; put away
每个N—N中插一个C原子，故C原子个数为6，每个N原子形成三个共价键已达饱和状态，不能再结合H，每个C还可结合2个H，H原子共6×2=12个。