一种烃的结构式可以表示为:
命名该化合物时,主链上的碳原子数是( )
A.9
B.11
C.12
D.13
有如图所示的2条链含有的碳原子数最多,每条碳链含有12个碳原子,
.
故选:C.
It was a serious mistake, ______ caused by carelessness.
A.which I think was
B.which I think it was
C.I think which was
D.that I think it was
胃位于腹腔右上部,肝脏位于腹腔的左上部.______.(判断对错)