KM压滤机滤板间连接圆环不得扭曲。
参考答案：对
--- I promise my daughter ____ get a nice present on her birthday.
--- I think it will be a big surprise to her.[ ]
A. must
B. shall
C. might
D. need
4E级的机场是指跑道长度在（）的机场。
A.800~1200
B.1200—1800
C.1600米以上
D.1800米以上
