HTTP通信协议
参考答案:
使用者与服务器的沟通是通过HTTP这种通信协议来进行的,使用者的浏览器通过这种协议来向服务器索取资料,服务器也遵循此种协议向浏览器或送资料。
--- Are you going to attend Jay Chou Concert in Suqian this weekend?
--- ______. It’s too good a chance to miss. I’m his die-hard fan.
A.It’s up to you
B.That’s for sure
C.Bad news travels fast
D.I have faith in him
在平面直角坐标系中,定义点P(x1,y1)、Q(x2,y2)之间的“直角距离”为d(P,Q)=|x1-x2|+|y1-y2|.若C(x,y)到点A(1,3),B(6,9)的“直角距离”相等,其中实数x、y满足0≤x≤10,0≤y≤10,则所有满足条件点C的轨迹的长度之和为 ______.