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【单选题】
关于食管平滑肌瘤，以下错误的是
A.
起源于食管粘膜的良性肿瘤
B.
90%位于食管中下段
C.
多为单发
D.
多有完整包膜，质坚硬，呈灰白色
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【单选题】用波长λ = 500 nm 的单色光垂直照射在每厘米 2000 条刻痕的光栅上,第五级明纹对应的衍射角为( )
A.
30 ° ；
B.
45 ° ；
C.
60 ° ；
D.
90 ° ；
查看完整题目与答案
【单选题】According to the passage, criticism of free market solutions in education arises from the fact that___________
A.
their values are too subjective
B.
the educational context is not a free market
C.
they do not explain why their set of values are better than others
D.
their values are too different from those within an educational context
查看完整题目与答案
【单选题】Nowadays, children are ________ too many violent online games, which is bad for the development of their characters.
A.
defeated by
B.
limited to
C.
handled by
D.
exposed to
查看完整题目与答案
【单选题】Disadvantages as they have, online games never fail to _____ a large number of teenagers．
A.
appeal to
B.
object to
C.
refer to
D.
turn to
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【单选题】A land free from destruction, plus wealth, natural resources, and labor supply--all these were important factors, in helping England to become the center for the Industrial Revolution. (31) they were ...
A.
But
B.
And
C.
Besides
D.
Even
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【简答题】In today’s Internet age, the demand for online s continues to grow. Online computer centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people ten...
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【简答题】用波长λ=500nm的单色平行光垂直照射到每厘米1000条缝的衍射光栅上，光栅距屏100cm，求第二级光谱线与中央明条纹的距离．
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【单选题】用波长为λ=500nm的单色光垂直照射如图的劈尖膜(n 1 >n 2 >n 3 ,n 2 =1),观察反射光干涉。则下列说法中正确的是:
A.
该劈尖的棱边条纹为明纹;
B.
任意相邻的明条纹中心所对应的膜厚之差都为250nm;
C.
从劈尖的棱边开始算起,第二条明纹中心所对应的膜厚度为500nm。
D.
劈尖干涉为等厚干涉。
查看完整题目与答案
【单选题】----Many online games are full of violence, which do harm to the development of the children. ----And that’s _______ my concern lies.
A.
what
B.
which
C.
where
D.
that
查看完整题目与答案
【简答题】In today's Internet age, the demand for online s continues to grow. Online computer centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people ten...
查看完整题目与答案
相关题目：
【单选题】用波长λ = 500 nm 的单色光垂直照射在每厘米 2000 条刻痕的光栅上,第五级明纹对应的衍射角为( )
A.
30 ° ；
B.
45 ° ；
C.
60 ° ；
D.
90 ° ；
查看完整题目与答案
【单选题】According to the passage, criticism of free market solutions in education arises from the fact that___________
A.
their values are too subjective
B.
the educational context is not a free market
C.
they do not explain why their set of values are better than others
D.
their values are too different from those within an educational context
查看完整题目与答案
【单选题】Nowadays, children are ________ too many violent online games, which is bad for the development of their characters.
A.
defeated by
B.
limited to
C.
handled by
D.
exposed to
查看完整题目与答案
【单选题】Disadvantages as they have, online games never fail to _____ a large number of teenagers．
A.
appeal to
B.
object to
C.
refer to
D.
turn to
查看完整题目与答案
【单选题】A land free from destruction, plus wealth, natural resources, and labor supply--all these were important factors, in helping England to become the center for the Industrial Revolution. (31) they were ...
A.
But
B.
And
C.
Besides
D.
Even
查看完整题目与答案
【简答题】In today’s Internet age, the demand for online s continues to grow. Online computer centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people ten...
查看完整题目与答案
【简答题】用波长λ=500nm的单色平行光垂直照射到每厘米1000条缝的衍射光栅上，光栅距屏100cm，求第二级光谱线与中央明条纹的距离．
查看完整题目与答案
【单选题】用波长为λ=500nm的单色光垂直照射如图的劈尖膜(n 1 >n 2 >n 3 ,n 2 =1),观察反射光干涉。则下列说法中正确的是:
A.
该劈尖的棱边条纹为明纹;
B.
任意相邻的明条纹中心所对应的膜厚之差都为250nm;
C.
从劈尖的棱边开始算起,第二条明纹中心所对应的膜厚度为500nm。
D.
劈尖干涉为等厚干涉。
查看完整题目与答案
【单选题】----Many online games are full of violence, which do harm to the development of the children. ----And that’s _______ my concern lies.
A.
what
B.
which
C.
where
D.
that
查看完整题目与答案
【简答题】In today's Internet age, the demand for online s continues to grow. Online computer centers exist in many cities and towns throughout Asia. Facing the pressures of school and life, people ten...
查看完整题目与答案