某家电生产企业开通网上商店,为终端消费者进行商品配送,提供电子支付系统,该企业的电子商务模式是()。
A.B2B
B.B2C
C.B2G
D.C2C
参考答案:B
在国际单位制中,电能的单位是______,符号是______,常用单位是______,符号是______,也叫做______.1KW•h=______J.
Leave your key with your neighbor you lock yourself out one day. [ ]
A. as long as
B. even though
C. in case
D. as if