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【单选题】
目前许多外部设备(如数码相机、打印机、扫描仪等)采用了USB接口,下面关于USB的叙述中,错误的是_______ 。A.
3.0版的USB接口数据传输速度要比2.0版快得多
B.
利用"USB集线器",一个USB接口能连接多个设备
C.
USB属串行接口
D.
主机不能通过USB连接器引脚向外设供电
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举一反三
【单选题】—On the contrary, I think it is the mother, rather than her children, _________to blame. —I agree with you.
A.
what is
B.
that is
C.
who are
D.
that are
【简答题】下列选项中,哪一项不是Shell的合法循环结构。A.until do done; B.do until done; C.for do done; D.while do done;
【单选题】听力原文：W: Jane told me she was going to quit her job. I'll certainly be sorry to see her go. M: Oh, she always says that! I wouldn't buy her a going-away present if I were you. What does the man think a...
A.
She will quit her job.
B.
She will be sorry if she quits her job.
C.
She will not quit her job.
D.
She will not accept his present.
【单选题】下列选项中,哪一项不是Shell的合法循环结构。
A.
until do done
B.
do until done
C.
for do done
D.
while do done
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