活鱼车具有密封、保温、增氧、排污、出鱼等自动化装置，可以高密_爱下问搜题

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问题单项选择题

活鱼车具有密封、保温、增氧、排污、出鱼等自动化装置，可以高密度、长距离运输食用鱼，其鱼、水比例为：（）

A、1：2

B、1：3－4

C、1：6

D、2：1

答案

参考答案：A

选择题

Nearby _____ in which they had spent their summer vacation. [ ]

A. was two houses

B. two houses were

C. were two houses

D. are two houses

问答题简答题

什么是等值梁法？