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【简答题】
钨的逸出功是4.52eV,钡的逸出功是2.5eV,分别计算钨和钡的截止频率,哪种金属可以用做可见光范围的光电阴极材料?
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举一反三
【单选题】If you want to see a combination of Eastern and Western art, you can go to see______.
A.
Zhang Yongxu's exhibition of oil paintings.
B.
The Art show from Nanjing
C.
The Western Art Show.
D.
Gu Kaizhi's paintings on Jan.5.
【单选题】疟疾病人发生黑尿热时,错误的治疗措施是
A.
立即停用奎宁、伯氨喹等可能诱发溶血反应的药物
B.
保证每日液体入量3000～4000ml
C.
少量多次输新鲜全血
D.
禁用糖皮质激素
E.
口服或静滴碳酸氢钠溶液
【单选题】If you want to see a combination of Eastern and Western art, you can go to see ______.
A.
Zhang Yongxu's exhibition of oil paintings
B.
The Art show from Nanjing
C.
The Western Art Show
D.
Gu Kaizhi's paintings on Jan. 5th
【单选题】If you go to see a doctor, the doctor will have your temperature ____ at first.A．checkB．examine
A.
298. If you go to see a doctor, the doctor will have your temperature ____ at first. A．check
B.
examine
C.
taking
D.
Taken
【简答题】已知随机变量X的分布函数为 请计算 ______, __________, __________, __________(请用分数表示,形如“b/a”)
【简答题】与一井定向相比,两井定向的优势是什么?
【单选题】If you go to see a doctor, you should of your illness to a doctor.
A.
think
B.
make
C.
complain
D.
hide
【简答题】设随机变量X的分布函数为设随机变量X服从N(μ，σ2)，试求P{｜X一μ｜＜σ}的值．已知标准正态分布函数φ(x)设随机变量X服从N(μ，σ2)，试求P{｜X一μ｜＜σ}的值．已知标准正态分布函数φ(x)的值有φ(1)=0．841 3， φ(0．5)=0．691 5， φ(2)=0．977 2．
【单选题】If you want to see stuffed fish and birds, which floor should you go to?
A.
The third floor.
B.
The fourth floor.
C.
The fifth floor.
D.
The sixth floor.
【单选题】疟疾病人发生黑尿热时，错误的措施是
A.
立即停用奎宁、伯氨喹等可能诱发溶血反应的药物
B.
保证每日液体入量3000-4000ml
C.
应用碳酸氢钠溶液口服或静脉滴注
D.
禁用糖皮质激素
E.
少量多次输新鲜全血
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