知识贝壳
知识贝壳
所属栏目：世界英汉杂辑
There are three systems of measurement. The avoirdupois sys-tem is the common one for general purposes. The long hundred-weight and long ton are the ones in use in Britain; the short hun-dredweight and short ton are used in America. The troy system isused ......（本文共 362 字 ） [阅读本文] >>