光球_爱下问搜题

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问题名词解释

光球

答案

参考答案：太阳大气中可见光波段能见到的区域。

选择题

There are a few people in the room, ____?

A. are there
B. aren't there
C. are they
D. aren't they

判断题

船用对讲机（直通）电话系统是用两台声力电话机直接固定联接，常用于重要部位的联络。