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【单选题】
下面关于子类型的描述中，错误的是( )。A.
子类型关系是可逆的
B.
公有派生类的对象可以初始化基类的引用
C.
只有在公有继承下，派生类是基类的子类型
D.
子类型关系可以传递
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举一反三
【单选题】--- Could I have a word with you，Mr. White? --- OK．__________ you make it short．I've got a meeting in five minutes．
A.
as far as
B.
if only
C.
so long as
D.
now that
【单选题】Richard: Oh, I've got to go._________ . Robbie: It was a pleasure meeting you, too. Bye-bye.
A.
It was nice of you to meet me
B.
It was nice to have met you
C.
It was nice meeting you here
D.
It was nice for you to meet me
【单选题】—The sports meeting will be ________ till next week because of the bad weather. —I’ve got it.
A.
put off
B.
given up
C.
put away
D.
given out
【简答题】某机共有156条指令,采用一地址格式,则指令字需取____位才能直接寻址K个存储单元。完成一条这种格式的加法指令,需访问______次存储器。
【简答题】下列不属于刺激性气体的是()。
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