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【多选题】
根据辐射能量传递方式，光谱可分为（ ）。（此题为多选题）A.
发射光谱法
B.
吸收光谱法
C.
X 射线衍射法
D.
拉曼光谱法
E.
荧光光谱法
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【简答题】阅读理解。 Air is all around us. It is around us when we walk and play. From the moment we are born, air surrounds (包围) us. When we sit down, it is around us. When we go to bed, air is also around us. No m...
【简答题】Air is always around us. It is around us when we walk and play. From the time we are born, air is around us. When we sit down, it is around us. When we go to bed, air is also around us. We live in air...
【单选题】Air is all around us. It is around us when we walk and play. From the moment we are born, air surrounds us. When we sit down, it is around us. When we go to bed, air is also around us. No matter where...
A.
a few months
B.
a few weeks
C.
a few days
【单选题】We help our parents when animals are born, and we take care of these animals until they_____.
A.
dying
B.
death
C.
die
【简答题】操作 ; しんせつ ; みせ ; にんき ; 下手 ;
【简答题】Air is all round us．It is around us___ 31_ ___we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 3...
【简答题】阅读理解。 Air is all around us. At the time we are born, air is around us everywhere (任何地方). We live in air. All living things need air. Living things cannot live without(没有) air. We can go without food o...
【简答题】Language is a way to communicate with each other. We started to learn language when we were born. However, people are used to speaking their native language, so immigrants are having many problems bet...
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