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【简答题】
单色可见光垂直入射缝宽0.5mm的单缝,缝后有一焦距为1m的凸透镜,在透镜焦平面上观察衍射图样,在距中央中心3mm处的P点为一暗纹中心,求 (1)入射可见光波长的可能值(可见光波长范围390nm~760nm) (2)不同的波长,P点对应第几级暗条纹,对应几个半波带 (3)对应以上可能值中波长最小的单色光,其形成的中央的线宽度
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【单选题】a green house is a building made of glass which is used for keeping plants warm when the outside temperature is low. In a similar way there are several gases in the atmosphere which trap the heat prod...
A.
the way in which gases are used for keeping plants warm
B.
a natural course which is to some degree helpful to us.
C.
the way greenhouse gases trap heat on the earth
D.
the whole course in which greenhouse gases prevent heat .
【简答题】The air filter is used on engine to trap contaminants, yet provide a free flow of air into the engine.
【判断题】The air filter is used in the engine to trap contaminants, yet provide a free flow of air into the engine. Air filters which are usually used in cars are made of paper element. These filters permit ai...
A.
正确
B.
错误
【简答题】按钮的哪个属性用于定义事件响应方法?
【单选题】A high-temperature alarm or______which will melt is used to guard against the explosion of comperssor air pipelines.
A.
a flame trap
B.
a relief valve
C.
a fusible plug
D.
a bursting cap
【单选题】**A high temperature alarm or ____ which will melt is used to guard against the explosion of compressor air pipelines.
A.
a flame trap(阻焰器)
B.
a relief valve
C.
a fusible plug(易熔塞)
D.
a bursting cap(防爆)
【单选题】A high temperature alarm or （） which will melt is used to guard against the explosion of compressor air pipelines.
A.
a flame trap
B.
a relief valve
C.
a fusible plug
D.
a bursting cap
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