判断题：测量1Ω以下的小电阻宜采用直流双臂电桥。A．正确B．错误

[阅读理解]Martin Luther King was a black minister, who became a great leader of...

[阅读理解] Look at the instructions on the bottle of the medicine and then c...

[ 词汇与结构]—They have learned about ______ in recent years.A several hundreds Engli

[阅读理解] Today the official language of the United Sates and most of Canad...

[阅读理解] Long, long ago there was no zero. To write the number sixty-three...