现浇楼梯段施工缝应留置平台向上2~3个踏步的范围内。
A. 正确
B. 错误
The younger motorman as well as the others () to operate the oil separator.
A. has learnt
B. have learnt
C. learn
D. are learning
装载机动力换挡变速器(),会造成换挡离合器磨损、温度升高、打滑。
A. 油位过高
B. 油位过低
C. 换挡油压过高
D. 换挡油压过低
在正常条件下,生物膜的膜脂呈()态,当温度下降到一定程度时,膜脂变为晶态。