肝脏细胞中,含量最多的化学元素是 [ ]
A.C
B.O
C.H
D.N
B
某工程双代号网络计划如下图所示,其中关键线路有()条。
A.1
B.2
C.3
D.4
I like places _____ the weather is neither too hot nor too cold.[ ]
A. where
B. that
C. which
D. what