下列哪项不属于燃气输配系统的组成部分？
A.燃气管网
B.储气设施
C.用户燃具
参考答案：C
She always gets tired. We all think she is _____ heavy. [ ]
A. too much
B. much too
C. too many
D. many too
AFTN报文的报头可以使用ZCZC和（）。
A、S0H
B、NNNN
C、GG
D、FF
