女性，27岁。活动后突感右下腹放射痛，伴恶心。既往有类似发病史。查体：腹软，右下腹有深压痛，无肌紧张。右肾区叩痛明显。尿常规：白细胞3～4个/HP，红细胞20～30个／HP。X线腹部平片：右输尿管上段有一0.8cm阴影。B超检查：右肾轻度积水。目前最好的治疗方法是（）。

A.体外震波碎石

B.输尿管切开取石

C.肾镜取石

D.解痉止痛，体外震波碎石

E.非手术排石

Multiple fire pumps may be used for other purposes provided that one pump is（）.

A.on line to the fire main

B.kept available for use on the fire main at all times

C.capable of being connected to the fire main

D.rated at or above 125 psi