The principle of the conservation of energy states that in a steady flow the sum of all forms of mechanical energy in a fluid along a stream line is the same at all points on that stream line. 句中第一个 that 为连词，引导宾语从句，宾语从句为（）结构，主干为 the sum is the same，其余部分为修饰语。|北开题库

[单选题]The principle of the conservation of energy states that in a steady flow the sum of all forms of mechanical energy in a fluid along a stream line is the same at all points on that stream line. 句中第一个 that 为连词，引导宾语从句，宾语从句为（）结构，主干为 the sum is the same，其余部分为修饰语。

北开题库

2023-10-01 08:02:16