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【简答题】
互换性按其互换程度可以分为 和 。
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皮皮学刷刷变学霸
举一反三
【单选题】There seems never to have been a civilization without toys, but when and how they developed is unknown. They probably came about just to give children something to do. (76) In the ancient world, as is...
A.
their social roles are rigidly determined
B.
most boys would like to follow their fathers' professions
C.
boys like to play with their fathers while girls with their mothers
D.
they like challenging activities
【简答题】题如图所示电路中，I s =52.5A，R 1 =R 3 =R 5 =10Ω，R 2 =R 4 =R 6 =20Ω，求电流，I。
【单选题】哥特摇滚风以其鲜明的特点占据了时尚风格一席之地,其表现为喜欢黑色、黑暗的颜色,有的时候也会用白色,它带有一种非常明显的一种( )的色彩
A.
黑暗
B.
奇特
C.
宗教
D.
嘻哈