Americans generally use either the short ton or the kip in their stress calculations . 美国人在桥梁的应力计算中通常用短吨,或者用千镑。
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Standards differ. some goods are designed in inches, feet, pounds, and short tons; some in metric measurements . 度量衡标准也各不相同。有些商品是按照英寸,英尺,磅与短吨来设计的;而其他一些商品则采用公制的度量衡。