单词：self oscillatory system
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841 、 埋头铆钉 countersinkheadrivet 842 、 埋头锥孔 countersink 843 、 埋头螺栓 countersinkheadbolt 844 、 埋头螺丝 countersinkheadscrew 845 、 埋头钻 countersinkdrill 846 、
发表于:2018-11-29 / 阅读(320) / 评论(0)
英文名句短语
英文名句短语
Keeping Time With Quartz Most people know that wrist watches commonly contain quartz. In fact, if you wear a watch, chances are its a quartz watch, since most watches is made today use quartz. But, you may not know what quartz has to do with keeping
发表于:2018-12-31 / 阅读(199) / 评论(0)
英语听力文摘 English Digest
英语听力文摘 English Digest