先乘除，再加减就说先乘后除，先加后减．______．

The mother of a 3-year-old calls the emergency room nurse at 3.00 AM and reports her child has a temperature of 101.1°F (38.4℃), a runny nose, and a barky cough that "gets going and won’t stop. " The mother states that she just gave the child acetaminophen (Tylenol). Which of the following should the nurse recommend next

A. Giving the child an over-the-counter decongestant.
B. Administering aspirin in 2 hours.
C. Sitting with the child in a steamy warm bathroom.
D. Running a steam vaporizer near the child’s bedsid

沉淀池的出水堰板在使用过程中可能会出现（），应定期检查与调整。

空气中氧气的体积含量约为（　　）

A．78%

B．21%

C．0.94%

D．0.03%

运行下列程序的结果是 ( ) abstract class MineBase {abstract void amethod()；static int i；} public class Mine extends MineBase { public static void main(String argv[]){ int[]ar=new int[5]； for(i=0;i＜ar.length；i++) System.out.println(ar[i])；

A．打印5个0

B．编译出错，数组ar[]必须初始化

C．编译出错，Mine应声明为abstract

D．出现IndexOutOfBoundes的例外