起重用电动机的工作状态有哪些？
参考答案：
电动机状态、再生制动状态、反接制动状态、单相制动状态。
甲、乙两国的矿产资源储量、产量均居世界前列的是( )
A．石油
B．有色金属
C．黄金
D．铁矿石
Health is very important to us. We should eat more vegetables and fruit instead of _____ rich food. [ ]
A. too much
B. much too
C. very much
D. too many
