客户要求办理宽带装机业务，遇暂无资源情况时，客服代表应做好（）工作。
A.预受理
B.预收费
C.预约上门服务
D.告知客户具备条件后再来办理
参考答案：A
The young man came _______ to the airport hurriedly only_______his girl friend had already gone.
A．driving; to find
B．to drive; to find
C．and drove; found
D．driving; finding
分析自然电位的成因，写出扩散电动势、扩散吸附电动势、总电动势表达式。
