皮皮学，免费搜题
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【多选题】
MRI中电磁波产生磁共振现象的基本条件包括( )A.
磁性原子核
B.
静磁场
C.
适当频率
D.
高强度脉冲
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The old man began to learn to drive a car at the age of _____. [ ]
A.
sixty
B.
the sixtieth
C.
sixty years old
D.
sixties
【简答题】简述BIOS的基本作用。
【简答题】简述 BIOS 的作用。
【简答题】简述系统功能调用和BIOS中断的作用和一般调用方法。
【单选题】听力原文： More than sixty percent of all homes in the United States have at least one thing in common: the people living in them keep one or more small animals as pets. These pet owners spend about ten bi...
A.
They keep one or more small animals at home as pets.
B.
They kill animals from time to time.
C.
They let animals run or fly away now and then.
D.
They exchange their animals year in and year out.
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