实验研究方法是指从问题出发，在相关的（）上或前提假设下进行有_爱下问搜题

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问题单项选择题

实验研究方法是指从问题出发，在相关的（）上或前提假设下进行有计划的验证，从而得出一定的科学结论的方法。

A.假设

B.理论基础

C.已有成果

D.研究方法

答案

参考答案：B

多项选择题

关于城市燃气输配管道的压力表述中，正确的有（）

A.高压燃气管道A：0.8

B.次高压燃气管道B：0.4

C.中压燃气管道A：0.2

D.中压燃气管道B：0.01

E.低压燃气管道：P≤0.01（MPA.

完形填空

Lucy and I are in the same class. She’s a student and is always the best in the class in her studies. She often goes to school by bike because her home is a little from the school. She beside me in the classroom. Lucy likes very much and often takes exercises after school. She often helps me with my studies and I her very much.