cross-sectional area短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 横截面积 The under water pipelines were laid into the stable bed by ditch burying of full cross-sectional area to ensure the safety of underwater pipelines. 水下穿越管线采用全断面沟埋敷设于河床稳定层内,确保了穿越管段的安全。 cnki That would give me a cross-sectional area of eight times ten to the minus five square meters. 那么横截面就等于,8乘以10的,负五次方平方米。163