单项选择题

传递函数与系统的阶跃响应是一对变换对
A、正确
B、错误

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单项选择题

What is the most important reason for limiting the number of main points in a speech?
A、It is hard to maintain parallel wording if there are too many main points.
B、It is hard to phrase the central idea if a speech has too many main points.
C、It is hard to organize supporting materials if there are too many main points.
D、It is hard for the audience to keep track of too many main points.

多项选择题

分割褶裥式晚礼服面料宜选择什么质地特征的织物，比如丝绸、丝绒类等。
A、柔软
B、有弹性
C、粗犷
D、挺括