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【单选题】
氢原子辐射出一个光子后,根据玻尔理论下述说法中正确的是( )A.
A．电子绕核旋转的半径增大
B.
氢原子的能级增大
C.
C．氢原子的电势能增大
D.
氢原子的核外电子的速率增大
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举一反三
【单选题】Time ____ never comes again. So we’d better make full use of our time.
A.
losing
B.
lost
C.
being lost
D.
having lost
【单选题】自信是成功的必要品质,属于自信的表现的是:
A.
小夏每次都接受额外增加的工作任务
B.
小何不相信自己的团队成员，很多工作都亲力亲为
C.
小章的工作常常因接待来访者而被搁置
D.
小贺经常对自己进行积极暗示
【单选题】Once_______, Jo devoted her life to looking after children and being a full-time homemaker. [ ]
A.
having married
B.
being married
C.
marrying
D.
married
【单选题】下列行为,属于侵犯公民的通信自由和通信秘密的是( )。
A.
局投递员小李因工作上的怒火毁弃邮件
B.
师为提高学生成绩拆看学生的信件
C.
业为提高效率禁止员工寄信件或拆看来信
D.
导怀疑下属背后说自己坏话拆看下属信件
E.
安机关或检察机关执行任务,依法律程序对公民的通信进行检查
F.
母或其他监护人代拆无行为能力的未成年人和精神病患者的信件
G.
①③⑤⑥
H.
.①②③④
I.
①②③⑤
J.
②④⑤⑥
【简答题】根据提示和上下文,用括号中单词的恰当形式填空。 1. I had to take this one. I had no other_______________. (choose) 2. These problems should be approached in a_______________ way. (science) 3. He visited Shanghai at the mayor...
【简答题】For years, the U.S. has experienced a shortage of registered nurses. The Bureau of Labor Statistics projects that while the number of nurses will increase by 19 percent by 2022, demand will grow faste...
【单选题】香农采样定理指出,如果采样器的输入信号e(t) 具有有限带宽,并且有ωm 的最大频率分量,则要使采样信号e*(t) 能不失真地恢复成连续信号e(t) 的采样周期 T ,应满足条件( )
A.
T≤2π/2 ωm
B.
T≥2π/2 ωm
C.
T≤2 ωm
D.
T≥2 ωm
【单选题】______ enough time, he was full of confidence to finish the project.
A.
Offered
B.
Being offered
C.
Having offered
D.
Offering
【简答题】Life expectancy dramatically increased throughout the world in the 20th century largely due to the ______ and ______ of numerous infectious diseases and the near ______ of infant mortality. Throughout...
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