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【简答题】
程序控制系统可以是开环系统也可以是闭环系统
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【简答题】What will happen several months after the explosion of thee star?
【简答题】请编程将“china"译成密码,密码规律是:用原来的字母后面第4个字母代替原来的字母。
【单选题】在c语言中关于循环语句的结论中,错误的是( )。
A.
do-while语句构成的循环至少要执行一次
B.
while语句和for语句可以相互替代
C.
for和while语句的循环控制条件都是当条件成立时执行循环体
D.
do-while语句的循环控制条件是当条件不成立时继续执行循环体
【单选题】At home Theodore Roosevelt had affection, not compliments, whether these were unintentional and sincere or were thinly disguised flattery. And affection was what he most craved from his family and nea...
A.
he was not flexible with his schedule
B.
the President tried to fulfil his promises to them
C.
he would stopped whatever he was doing for them
D.
the President apologized to them when he could not stay with them
【多选题】关于while和do-while语句,以下描述中正确的是( )。
A.
while语句是先判断后执行， do-while语句是先执行后判断。
B.
do-while语句构成的循环不能用其它语句构成的循环来代替
C.
用do-while语句构成的循环，在while后的表达式为非零时结束循环
D.
当while后的条件表达式一开始就为假时，两种语句的执行结果不同。
【单选题】According to the author, Theodore Roosevelt ______.
A.
was a hard-working President
B.
tried to reduce the length of his workday
C.
really appreciated the idea of eight or six hours per workday
D.
wished to work with the laboring men of today
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