皮皮学，免费搜题
登录
搜题
【判断题】
古代说“草屦”，是草鞋。()A.
正确
B.
错误
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【简答题】函数y=2sinx的最小正周期是______．
【单选题】When Mary received the life-changing news, she __.
A.
lost control of herself
B.
began a balanced diet
C.
Med to get a treatment
D.
behaved in an adult way
【简答题】When my daughter was five, we gave her a piano as her birthday gift, with great excitement; she began learning piano under the teacher’s guidance. However, when she was no longer curious about it, she...
【单选题】下列微分方程所描述的系统为线性时不变系统的是（ ）
A.
y''(t) + y'(t)y(t) = f(t)
B.
y'(t) + 2y(t) = f(-t)
C.
y'(t) +3y(t) = f'(t) + 2f(t)
D.
y'(t) + 2y(t) = |f(t)|
相关题目：
参考解析：
知识点：
题目纠错 0
发布
