改变模型的管道尺寸、管道出口形式和管道位置等参数,比较了各参数对模型声学响应的影响规律。
Models with different duct dimensions, duct discharges and duct locations are constructed, and their response to unit harmonic pressure is analyzed and compared.
就美国企业的总体情况看,企业在国外所生产的产品销售量远远大于美国产品以商品出口形式输出的销售量。
For U. s. Firms as a whole, sales from output produced abroad are many times greater than sales from U. s. production that is sent abroad as merchandise exports.
就美国企业的总体情况看,企业在国外所生产的产品销售量远远大于美国产品以商品出口形式输出的销售量。
For U. s. Firms as a whole, sales from output produced abroad are many times greater than sales from U. s. production that is sent abroad as merchandise exports.
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