【单选题】Read the following paragraph from the section "Your Bones Are Alive." There are different kinds of bone cells. There is smooth bone on the outside of all bones. It is hard. There are also webs of bone...
【单选题】while 循环和 do-while 循环的区别是 ( ) 。(选择一项) A. 没有区别,这两个结构在任何情况下效果一样 B. while 循环比 do-while 循环执行效率高 C. while 循环是先循环后判断,所以循环体至少被执行一次 D. do-while 循环是先循环后判断,所以循环体至少被执行一次 9. 在 Java 中有如下代码,则编译运行该类的输出结果是( )。(选择一项) ...