_____ of them knows French, so I have to

下图所示表层海水等温线所在半球和洋流类型是

Ａ、北半球、暖流

Ｂ、北半球、寒流

Ｃ、南半球、暖流

Ｄ、南半球、寒流

一般均衡既意味着消费者效用最大化，也意味着厂商利润极大化。（）

DEH--ⅢA对哪些信号进行了三选二处理？

When I talked with my grandma on the phone, she sounded weak, but by the time we （）up, her voice had been full of life.

A. were hanging

B. had hung

C. hung

D. would hang

浇注系统的平衡