【单选题】Users should ___________(珍惜)the bikes they are using.
【简答题】由方程组 可得, x ∶ y ∶ z 是…… ……… …………………( ) A.1∶2∶1 B.1∶(-2)∶(-1) C.1∶(-2)∶1 D.1∶2∶(-1)
【单选题】She wasn’t fired. She left our company ________________.
【单选题】That was one of her most __________ memories.
【单选题】Massive changes in all of the world's deeply ______ sporting habits are underway.
【单选题】_______ time is a good habit for all of us.
【单选题】工时定额通常包括作业时间、布置工作地时间、休息与()时间,以及加工准备时间和结束时间。
【多选题】本章视频中赵老板和林总之间的冲突属于( )。