指挥抓管机卸车时，应站在抓管机正前方5m以外，严禁站在两侧位置，防止钻具（）滑动时将人碰伤。
参考答案：套管
Because web servers are (31) and application independent, they can send or request data from legacy or external applications including databases. All replies, once converted into (32) mark-up language, can then be transmitted to a (33) . Used in this way, Intranets can offer (34) desktop support costs, easy links with legacy applications and databases and, above all, (35) of use.
A．browser
B．application
C．router
D．server
A11消息－注册请求应答，返回的代码为（），表示Authenticationerror。
A.131
B.00
C.128
D.130
