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【单选题】
我国确立社会主义初级阶段的基本经济制度的理论依据是A.
我国是社会主义国家，必须坚持公有制作为社会主义经济制度的基础
B.
我国处在社会主义初级阶段，需要在公有制为主体的条件下发展多种所有制经济
C.
一切符合“三个有利于”的所有制形式都可以而且应该用来为社会主义服务
D.
生产关系一定要适应生产力发展的规律
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【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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