下列化学用语表达错误的是( )
A.S2-结构示意图:
B.乙烯的结构简式:CH2=CH2
C.葡萄糖分子式:C6H12O6
D.氯化钠的电子式:
答案:D
I am a fan of Liu Qian. his magic his humor attracts me. [ ]
A. Both… and
B. Either…or
C. Neither…nor
D. Not only… but also
加工既有正孔、又有斜孔的工件可以将各孔分别设定成各自的工件坐标系。