自然伽马仪器的组合开关置直流挡时，传输到地面的测井信号是（）。
A、放射性脉冲
B、直流电平
C、正弦波
D、脉冲编码
参考答案：B
我国有优质的长绒棉产区有（ ）
A．新疆
B．河北
C．河南
D．江苏
Originally introduced by Netscape Communications,___(66)___ are a general mechanism which HTTP Server side applications, such as CGI (67) , can use to both store and retrieve information on the HTTP ___(68)___ side of the connection. Basically, Cookies can be used to compensate for the ___(69)___ nature of HTTP. The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based ___(70)___ .
A．graphics
B．processes
C．scripts
D．texts
