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[单选题]
以下代码片段的输出结果:()。var str ;alert(typeof str);
A.string ;
B.undefined;
C.object ;
D.String;
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A.string ;
B.undefined;
C.object ;
D.String;
A.25
B.28
C.31
D.30
A.0
B.1
C.2
D.3
A.20
B.20.0
C. NaN
D.155
A. substring(9,13),docurment. write(a):
B.stud
C.tuden
D.uden
E. udent
A.tsttst
B.testatest
C.testtest
D.tstatst
A.输出val is NULL
B.输出val is not NULL
C.语法错误
D.运行时出现异常
A./smit.log
B./var/adm/messages
C./var/spool/mail/root
D./var/spool/cron/cronlog
以下程序的输出结果为()。import math s=0 for i in range(1,10+1): m=int(math.sqrt(i) ) if m%2==0: continue s=s+i print(s)
运行以下程序,输出结果为()。s='I like purple flowers' lst1=s.split() lst2=[len(i) for i in lst1] lst 2.sort(reverse=True) print(lst2[0])