诊断休克的依据是A．血压下降B．脉率变快C．临床表现D．动脉氧分压＜60mmHgE．

The discovery of new evidence led to__________

A．the thief having caught

B．catch the thief

C．the thief being caught

D．the thief to be caught

On the morning of Christmas day, we often greet each other and say,"_____" [ ]

A. Happy New Year!

B. Merry Christmas!

C. Good luck!

D. Best wishes to you!

下列物质必须隔绝空气和水蒸气保存的是（   ）

①Na ②Na₂O ③Na₂O₂ ④NaOH ⑤Na₂CO₃

A．①②

B．②③④⑤

C．①②③④

D．①②③④⑤

将某盐酸与某氢氧化钠溶液混合，当达到pH=7时，测得溶液中钠离子与水分子个数比为1：20（设水都以分子形式存在）．则反应后溶液中溶质的质量分数是（　　）

A．6.0%

B．6.4%

C．14.0%

D．16.0%

下列程序段的输出结果是( )。
public class operatorsandexpressions
public static void main(String [] agrs)
int a=3,b=4,c=5;
System.out.pfintln("abc"+3);

A．15

B．abc3

C．256

D．63