A.
B.
C.
D.
[单选题]A.B.C.D.
[单选题]高阶无穷小,y(0)=π,则y(1)等于( ).A.B.C.D.
[单选题]A.0.33B.0.44C.0.55D.0.66
[单选题]A.30℃B.31℃C.32℃D.32.8℃