It was just an ordinary voice, but he sang in tune.他声音很一般，但唱得都在调子上。At tea-time, Victoria sang duets with her Consort, Prince Albert.喝下午茶的时候，维多利亚与其夫君艾伯特亲王表演了二重唱。Caroline sang two verses and the chorus of her song.卡罗琳唱了她歌曲...
联轴器是把相邻的两个轴端连接起来的装置.A coupling is a device for connecting the ends of adjacent shafts.主要有齿轮 、 轴 、 泵体 、 安全阀 、 轴端密封所组成.This series are mainly gear , gear pump , valve, pump body, axial end seal.敞开操纵不正护罩, 发不隐轴端动拉螺母已松不静.Open...
a kilometre and a half of bitumen一公里半的柏油路面contain bitumen含沥青The irradiation stability of bitumen and bituminized producthas been investigated.本文研究了沥青及沥青固化产品的辐照稳定性.The article introduced the category of natural bitumen an...