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【单选题】
对某一定波长的垂直入射光，衍射光栅的屏幕上只能出现零级和一级主极大，欲使屏幕上出现更高级次的主极大，应该A.
换一个光栅常数较大的光栅
B.
换一个光栅常数较小的光栅
C.
将光栅向靠近屏幕的方向移动
D.
将光栅向远离屏幕的方向移动
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举一反三
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【单选题】Reginald is the manager of production department M in a factory which has ten other production departments. He receives monthly information that compares planned and actual expenditure for department ...
A.
A revenue centre manager
B.
A cost centre manager
C.
An investment centre manager
D.
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【单选题】Reginald is the manager of production department M in a factory which has ten other production departments. He receives monthly information that compares planned and actual expenditure for department ...
A.
A cost centre manager
B.
An investment centre manager
C.
A profit centre manager
D.
A revenue centre manager
【单选题】Reginald is the manager of production department M in a factory which has ten other production departments. He receives monthly information that compares planned and actual expenditure for department ...
A.
A cost centre manager
B.
An investment centre manager
C.
A profit centre manager
D.
A revenue centre manager
【单选题】Reginald is the manager of production department M in a factory, which has ten other production departments. He receives monthly information that compares planned and actual expenditure for department...
A.
A cost centre manager
B.
An investment centre manager
C.
A profit centre manager
D.
A revenue centre manager
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