A .5
B .6
C .4
D .2
[单选题]Student A: I am terribly sorry because I left your dictionary in the library and I just couldn't find it there.Student B:______I have a new one.
[单选题]I am a middle school student. I (11) at No.6 Middle School.our (12) is big. I (13) 0ur school.(14) begin at eight. We(15) four classes in the morning and two in (16) afternoom We study Chinese,maths, English and (17) lessons. There (18) fifty student
[单选题]NBDP以ARQ方式通信时,若传输的信息是“I AM EXAMINING NOW”,则分割成()个信息组发射。A .4B .5C .6D .7
[单选题]NBDP以AQR方式通信时,若传输的信息是I am examining now,则分割为()个信息组发射A .4B .5C .6D .7
[单选题]在ARQ方式中,基本通信周期为()/发射一个信息字组所需时间为()/用于信息单程运输时间为()A . 450ms/210ms/85msB . 280ms/70ms/85msC . 450ms/210ms/170msD . 280ms/210ms/170ms
[主观题]利用“屏幕键盘”在“记事本”窗口输入“I am a student.”,然后将该文件保存到D:/LK1.YXT。
[单选题]DSC和NBDP的发射类型为()A .J2BB .J3EC .G3ED . D.G1B
[单选题]NBDP设备的每个发射周期为()A .450msB .210msC .70msD .230ms
[单选题]NBDP设备进行通信时,若发射方要求改变信息流向时,应键入:()A .a-b-aB .↑+?C .RQ-a-RQD .RQ-RQ-RQ
[单选题]22.I am in _________ .A. Grade OneB. eightC. my friendD. Class One