某患者左肾盂单个结石约1.2cm大小,右肾盂多发结石,IVP显示双肾积水。处理应是
A.左肾盂切开取石
B.左肾造瘘
C.右肾盂切开取石
D.右肾造瘘
E.双肾造瘘
参考答案:A
The children parents are away working in cities are looked after well.
A.which
B.whose
C.that
D.who
异步电动机的启动转矩与电源电压的平方成正比。