所谓对象的特性,是指被控对象的输出变量与输入变量之间随()变化的规律。
A、过渡时间
B、上升时间
C、滞后时间
D、时间
参考答案:D
-What's the matter with Della?
-Well,her parents wouldn't allow her to go to the party,but she still _____. [ ]
A. hopes to
B. hopes so
C. hopes not
D. hopes for
天天酷跑目前更新后一共有多少角色?()
A.15
B.16
C.17
D.18