证明f（x）=3x2+2在区间[0，+∞）上是增函数．

基础写作

         After three years' staying together, you will say goodbye to your teachers soon. You must have much to say to your teachers.

       ·What you want to say to your English teacher most

       ·Why you want to say so

       ·What you want to tell her about your future planDear

Mrs Guo,

                                                                                                                                           Yours．

                                                                                                                                           Zhang Xu

男性，44岁，因患肝硬化、门脉高压症，突然一次大量呕血。患者表情淡漠，口渴明显，面色苍白，皮肤湿冷。心率115/min，血压85/60mmHg，呼吸浅快。考虑出现低血容量休克。

根据患者目前状况判断，失血量占全身总血量的比例约为

A．10%以下

B．10%～20%

C．20%～40%

D．40%～50%

E．超过50%

豹狮车指示灯盒有多少指示灯的作用柴油位过低警告。

托物言志

有下列程序： #include＜stdio.h＞ main() {char c1,c2,c3,c4,c5,c6； scanf("%c%c%c%c",&c1,&c2,&c3,&c4)； c5=getchar();c6=getchar()； putchar(c1);putchar(c2)； printf("%c%c\n",c5,c6)； } 程序运行后，若从键盘输入(从第1列开始)： 123＜CR＞ 45678＜CR＞ 则输出结果是( )。

A．1267

B．1256

C．1278

D．1245