以下哪些是PadsLayout在导出的格式()。
A.ASC.
B.TXT
C.OLE
参考答案:A, C
The App WeChat provides a networking platform ______ communication is faster and easier.
A.which
B.where
C.when
D.why
以y=C1e-x+C2e2x+sinx为通解的二阶常系数非齐次微分方程为______.