问题
选择题
Tom and Jack are going to have ______________ this afternoon. [ ]
A. sport
B. sports
C. the sports
答案
答案：B
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Tom and Jack are going to have ______________ this afternoon. [ ]
A. sport
B. sports
C. the sports
答案：B
，阻尼比为
，其单位斜坡响应的稳态误差为（）