【单选题】【消耗次数：1】
下面这些材料的逸出功为：铍，3.9eV；钯，5.0eV；铯，1.9eV；钨，4.5eV.要制造能在可见光（频率范围为3.9×1014Hz－7.5×1014Hz）下工作的光电管，在这此材料中应选：（）。
①
钨
②
钯
③
铯
④
铍
参考答案：
复制
纠错
相关题目
随机题目
【判断题】
判断线上的内容是否正确：In some countries girls are still ___deprived___ of a good education.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：More efforts, as reported, ___will be made___ in the years ahead to accelerate the supply-side structural reform.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：The past 22 years have really been amazing， and every prediction we’ve made about improvements have al come __true__
①
正确
②
错误
【判断题】
判断线上的内容是否正确：As the years passed, the memories of her childhood ___fired___ away.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：He did not __compromise___ easily, but was willing to accept any constructive advice for a worthy cause.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：___While___some people are motivated by a need for success, others are motivated by a fear of failure.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：—Jack still can’t help being anxious about his job interview. —Lack of self-confidence is his___Achilles’ heel___, I am afraid.
①
正确
②
错误
【判断题】
判断线上的内容是否正确：These two chemicals ____interact_____ with each other at a certain temperature to produce a substance which could cause an explosion.
①
正确
②
错误
【单选题】
Wow. That’s a marvelous room. I’ve never known you’re so artistic!____________
①
Thank you for your compliments.
②
Don’t mention it.
③
Great, I am very art-conscious.
④
It’s fine.
【单选题】
Could you make an appointment with Doctor Wilson for me?____________
①
I cannot do it for you.
②
Im afraid all the appointments are filled.
③
You can have it.
④
Can I help you?