题目内容

Tourism has little impact on natural resources and the environment.

A. 对
B. 错

查看答案

搜索结果不匹配？点我反馈

更多问题

People are supposed to spend quite a lot of money from tourism proetecting the environment.

A. 对
B. 错

Because of its damage to the environment, tourism will cease to develop.

A. 对
B. 错

若电力系统有n个节点，若有m个PV节点，一般有多少个PQ节点？

A. n-m+1
B. n-m
C. n-m-1
D. m-1

一般电力系统中，数量较少，甚至可以没有的，这种节点类型是（）

A. PQ
B. PV
C. 不确定
D. 平衡