PGM-48钢轨打磨车每块砂轮与电机发兰盘联接共有()螺栓。
A、1条
B、2条
C、3条
D、4条
参考答案:C
Sorry, I'm bus today.I have______ homework to do.[ ]
A. much too
B. too much
C. too many
C. many too
()不是大水面养殖类型。
A、水库养殖
B、湖泊养殖
C、围栏养殖
D、稻田养殖