皮皮学，免费搜题
登录
搜题
【多选题】
关于激光器产生激光的必要条件,下列说法不正确的为A.
工作物质处于热平衡状态
B.
工作物质实现粒子数反转
C.
激光器满足阈值条件
D.
工作物质发生受激吸收
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Excuse me, what _____ just now?
A.
happened
B.
to happen
C.
is happening
D.
did happen
【简答题】Do you think pure friendship exists between genders? Why or why not?
【简答题】A．At all the entrances. B．At some entrances. C．At all the exists. D．At some exists.
【简答题】听力原文：What time will the plane to Milan leave? Man: Excuse me. What time is the next plane to Milan? Woman: It should leave at quarter past seven but it's an hour late today. Man: That's a problem. If ...
【单选题】Excuse me, sir. Could you please tell me what number I should dial to get the ().
A.
throat
B.
verse
C.
conductor
D.
operator
【单选题】Excuse me! Could you please tell me what time ____ Kaili?
A.
the Greens left
B.
did the Greens leave
C.
the Greens leaves
D.
will the Greens leave
【单选题】Excuse me. What is your name?
A.
I am Kate. Are you Rich Chen?
B.
Who are you?
C.
Yes?
相关题目：
参考解析：
知识点：
题目纠错 0
发布
