物流发展的驱动因素有哪些？

The nurse in the substance abuse unit is trying to encourage a client to attend Alcoholics Anonymous (AA) meetings. When the client asks the nurse what he must do to become a member, which of the following the best response from the nurse

A．"Admit you're powerless over alcohol and that you need help. "

B．"You must bring along a friend who will support you. "

C．"You must first stop drinking. "

D．"Your physician must refer you to this program. "

今年，西南地区遭遇了百年一遇的干旱，农田大面积龟裂，饮用水严重缺乏。物理课上，小明问：怎么不向高空抛洒干冰实施人工降雨以缓解旱情？老师说：人工降雨是需要条件的。

（1）请问：在什么情况下才能实施人工降雨？

（2）水资源日益匮乏的今天，请你举出生活中节约用水的一项措施。

管道连接时，两相邻焊缝间的距离不应小于管径，但最小不得小于（）mm

A、200

B、210

C、220

特别潮湿场所、导电良好的地面、锅炉或金属容器内的照明，电源电压不得大于24V。

联合国通行证系联合国和其各专门机构根据联合国有关规定向本机构职员颁发的的具有护照效力的身份证件，有红皮和蓝皮两种，其中红皮通行证的效力相当于（）。

A、外交护照

B、特别护照

C、公务护照

D、普通护照