单项选择题 有如以下模块： module test; reg [3:0] start,result; initial begin start = 1; result = (start ＜＜ 2); end endmodule程序运行完毕，result的值是（ ）A.4’b0100B.4’b0010C.6’b000100D.4’b0000

问答题 Fill in the blanks. To all who come to this(____) place: Welcome.(____) is your land. Here (____) relives fond memories of the (____) , and here(____) may savor the challenge and promise of the (____)   A.happy   B. youth    C. Disneyland    D. past   E. future   F. age

单项选择题 如图所示电路中，三只二极管参数相同。若A、B、C三端电压分别为2V、3V、4V，若二极管压降为0.7V，试分析各二极管工作情况，求端口D的电压值。  ( )                A.0.7VB.1.7VC.3.3VD.2.5V