代理省级财政行政事业性收费业务时，代理行经办柜员使用（）交易单位文本数据转换格式定义.
A.9009
B.9061
C.9206
D.9210
参考答案：D
By serving others，a person focuses on someone other than himself or herself，______ can be very eyeopening and rewarding.
A．who
B．which
C．what
D．that
液化石油气钢瓶为何要进行定期检验？
