根据乘方的意义可知：53=5×5×5，54=5×5×5×5，则53×54=（5×5×5）×（5×5×5×5）=57即53×54=57。想一想：

测试题5 A: 51 B: 52 C: 53 D: 54

我国民族自治地方的面积占全国总面积的（） A: 64、5% B: 54、5% C: 74、5%

民航第二外语课程总共两学期占（）学时，（）学分。 A: 108；5 B: 54；3 C: 108；6 D: 54；4

已知100.3≈2，则（54）10≈（　　） A: 12 B: 10 C: 8 D: 5

对于：int a[] = {5, 15, 34, 54, 14, 2, 52, 72};int *p = &a[5];则：p[-2]的值是？

下列程序的运行结果是（ ）。t = 0 while t < 5: print(t, " is less than 5") t = t + 1else: print(t, " is not less than 5") A: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 55 is not less than 5 B: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 55 is not less than 5 C: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 5 D: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 5

编写下面一段程序，并上传到ArduinoUno板上，计算机串口监视器显示为voidsetup(){Serial.begin(9600);Serial.Write(54);}voidloop(){} A: 54 B: 5 C: 4 D: 6

54（军用）系列的TTL门电路。其电路结构和电气性能参数与74（民用）系列相同，主要区别在于54系列比74系列的工作温度范围更宽(74系列为0~70 2103，54系列为-55~+125 2103)， 电源允许的工作范围也更大(74系列为5 V(100b15%)，54系列为5 V(100b110%))。

标准麻花钻横刃处前角为（ ）。 A: -54°～-60° B: -10°～-20° C: 0° D: 5°