做灰线的工具,一般是根据灰线的尺寸形状制成木模,木模分阴模、阳模两种。( )
参考答案:错
My good friend Rose went to the party with her husband, ________ a happy evening of wine, food and
song.[ ]
A.expecting
B.to expect
C.expected
D.having expected
电力系统出现两相短路,短路点距母线的远近与母线上负序电压的关系是()。
A、距故障点越远负序电压越高
B、距故障点越近负序电压越高
C、与故障点位置无关