皮皮学，免费搜题
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【单选题】
以 SO 4 2- 沉淀 Ba 2+ 时,加入适量过量的 SO 4 2- 可以使 Ba 2+ 离子沉淀更完全。这是利用:A.
盐效应
B.
同离子效应
C.
络合效应
D.
溶剂化效应
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皮皮学刷刷变学霸
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【单选题】()是运用先进的技术手段将虚拟物体的空间无能运动转变成物理设备的机械运动,使用户能够体验到真实的力度感和方向感,从而提供一个崭新的人机交互界面。该项技术最早应用于尖端医学和军事领域。
A.
光学系统
B.
力反馈
C.
跟踪系统
D.
声音系统
【单选题】( )是运用先进的技术手段将虚拟物体的空间无能运动转变程物理设备的机械运动,使用户能够体验到真实的力度感和方向感,从而提供一个崭新的人机交互界面。该项技术最早应用于尖端医学和军事领域。
A.
光学系统
B.
力反馈
C.
跟踪系统
D.
声音系统
【简答题】They put beautiful flowers and plants in the entenrance _____________ .
【单选题】Tom_________the flowers on the desk every day. [ ]
A.
put
B.
puts
C.
putting
D.
will put
【简答题】Write about the following topic: In order to learn a language well, we should learn about the country as well as the cultures and lifestyles of the people who speak it. To what extent do you agree or ...
【单选题】People read newspaper to ______.
A.
learn about whatever they want
B.
learn about the most important news
C.
get some information (信息)
【单选题】The flowers were put on the table for ( ).
A.
ornament
B.
orenament
C.
ornamant
D.
ornement
【简答题】所谓力反馈,是运用先进的技术手段将虚拟物体的空间 运动转变成物理设备的机械运动,使用户能够体验到真实的 和方向感,从而提供一个崭新的 交互界面。该项技术最早应用于尖端医学和军事领域。
【单选题】What happened to the flowers which were put in a laboratory in constant darkness?
A.
They didn't open at all.
B.
They opened as if they were in a normal garden.
C.
They have circadian cycles of activity.
D.
They died without knowing the time of day.
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