_____ is your new pencil case? It's 13 yuan. [ ]
A. How old
B. How many
C. How much
答案:C
低压电力网中的电源系统工作接地电阻不超过()。
A.2Ω
B.3Ω
C.4Ω
D.6Ω
对同一笔商品交易可以重复办理银行承兑汇票。