【单选题】每个I/O端口位可以自由编程,然而I/0端口寄存器按( )位访问。
【单选题】以下程序的运行结果是 public class J_Test{ public static void main (String [] args){ int i=0; while (true) { if(++i>10) break; } System.out.println("i="+i); } }
【单选题】Newspaper publishers in the United States have long been enthusiastic users and distributors of weather maps. Although some newspapers that had carried the United States Weather Bureau's national weat...
A.
The differences between government and newspaper weather forecasting in the United States.
B.
The history of publishing weather maps in United States newspapers
C.
A comparison of regional and national weather reporting in the United States.
D.
Information that forms the basis for weather forecasting in the United States
【单选题】逻辑电路中若采用的是______管和PM0S管,电源电压为负值时,则采用_____比较方便。
【单选题】抗生素磺胺和化疗药氨甲蝶呤的作用机制均与一种维生素合成有关,这种维生素是
【简答题】某工厂考虑到环境保护的问题,来规划该厂的最佳生产方案, 已知工厂生产每件产品的成本是 2.7 元,售价是 10 元;在生产产品的同时,产生出 3 个单位的污水。污水可有两种排放方式:输送到污水处理厂,经处理(假设处理率为 85% )后排入河流下游或直接排入河中;若污水厂的最大处理能力是每单位时间 9 个污水单位,其处理成本是每单位污水 0.5 元;环保部门对排入水体的污水收费标准是每单位污水 1....
【单选题】以下程序的运行结果是 public class Increment{ public static void main(String args[]) { int a,b; a = 6; b=a++; System.out.print(b); System.out.print(b++); System.out.print(a); } }
【判断题】当出现时间戳错误时,可以使用当前时间来替代( )