执行如下语句:a$=“abcdefghijklnm” <CR>Number%=len(A. <CR>c$=lef1(a, 执行如下语句:a$=“abcdefghijklnm” Number%=len(A. c$=lef1(a,4)+Mid(a,5,Number-7) 分类:儿科护理 题型:单选题 查看答案