题目内容

以一个焦点为中心，层层环绕发射称为( )

A. 中心式发射
B. 同心式发射
C. 旋转式发射
D. 螺旋式发射

查看答案

搜索结果不匹配？点我反馈

更多问题

[音频]1

A. Looking for a job.
B. Traveling abroad.
C. Writing a term paper.
D. Working on a project.

2

A. Do some shopping.
B. Watch a football match.
C. Go fishing.
D. Visit their friends.

[音频]3

A. Sales Manager.
B. Marketing Manager.
C. Project Manager.
D. Research Manager.

4

A. Next Tuesday.
B. Next Wednesday.
C. Next Thursday.
D. Next Friday.