按照《施工合同示范文本》规定，施工现场内由承包人采购用于工程的材料和待安装设备，应由（）办理保险。

A．发包人

B．承包人

C．双方共同

D．有双方协商决定

●One of the main resposibilities of ICMP is to report（）.Although technology has produced increasingly reliable transmission media, errors still exist and must be handled．IP is an （） protocol．This means that error checking and error control are not a concern of IP．ICMP was designed，in part，to compensate for this shortcoming．Howerver, ICMP does not（） errors，it simply reports them．Error correction is left to the higher-level potocols．Error messages are always sent to the original （） because the only information available in the datagram about the route is the source and destination IP addresses．ICMP uses the source IP address to send the error massage to the source of the （） .

One of the main resposibilities of ICMP is to report（）.

A．numbers

B．functions

C．strings

D．errors