皮皮学，免费搜题
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【单选题】
共析氏体快速冷却到650°C,等温2s,没有到过冷奥氏体开始转变线,就快速冷却到室温得到的组织是( )组织。A.
珠光体
B.
马氏体
C.
贝氏体
D.
马氏体和珠光体
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】have_________
【单选题】In our school, the students are not allowed, unless they have special passes, ____ after 11pm.A．
A.
10. In our school, the students are not allowed, unless they have special passes, ____ after 11pm. A．from staying out
B.
stay out
C.
staying out
D.
to stay out
【单选题】钨的逸出功是【图片】，钡的逸出功是【图片】，则钨和钡的截止频率的关系为
A.
钨 的截止频率 大于钡的截止频率
B.
钨的截止频率小于钡的截止频率
C.
相等
D.
无法判断
【简答题】钨的逸出功是4.52eV，钡的逸出功是2.50eV，分别计算钨和钡的截止频率。哪一种金属可以用作可见光范围内的光电管阴极材料?
【简答题】钨的逸出功是4.52eV，钡的逸出功是2.50eV，分别计算钨和钡的截止频率。哪一种金属可以用作可见光范围内的光电管阴极材料?
【单选题】使用过氧乙酸消毒时应注意
A.
消毒物品需悬挂或抖散
B.
放于阴凉处避免高温引起爆炸
C.
浸泡金属类物品浓度为0.2%
D.
2%过氧乙酸溶液用于手的消毒
E.
不能用于体温表的消毒
【单选题】Why have classified advertisements changed in appearance?
A.
Because people no longer want headlines and pictures
B.
B) Because real estate advertising is particularly truthful now
C.
Because the increase in the number of such advertisements means they have to be small now.
D.
Because there are more advertisements now and more competition among advertisers.
【单选题】--- _______ there many trees on the campus? -No, but now we have many everywhere.
A.
Were
B.
Had
C.
Did have
D.
Do have
【简答题】to have a 10. _____ area for socializing
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