单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He can’t find his new apartment.
B．He had a bigger apartment before.
C．He finds the new apartment too big’ for him.
D．He’s looking for an apartment.
<上一题 目录 下一题>
热门 试题

单项选择题
Which of the following statements best describes a laser
A．A device for stimulating atoms and molecules to emit light.
B．An atom in a high-energy state.
C．A technique for destroying atoms or molecules.
D．An instrument for measuring light waves.
单项选择题
Why was Townes' early work with stimulated emission done with microwaves
A．He was not concerned with light amplification.
B．It was easier to work with longer wavelengths.
C．His partner Schawlow had already begun to work on laser.
D．The laser had already been developed.
相关试题