变压器的接线组别一般是指用时钟表示法表示三相变压器一、二次线圈的连接方式和它们（）的相位关系。
参考答案：线电压
The conflict had developed into a stage ______ the two countries were gathering big troops on the border.
A．where
B．when
C．which
D．that
测定内生肌酐清除率应注意做到（）
A.低蛋白禁肉食7d
B.同时测定血和尿肌酐
C.避免剧烈运动
D.大量饮水
E.准确留取24h尿
