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【多选题】
为了使多根天线之间有较低的互相关性，通常采用的技术为（ ）A.
空间分集
B.
极化分集
C.
时间分集
D.
频率分集
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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【简答题】与同容量的变压器相比较，感应电动机的空载电流大还是变压器的空载电流大，为什么?
【单选题】---This is the first time I _____ my first picture with my own hands. --- It’s time that you ____ a photo of me.
A.
took; took
B.
have taken; took
C.
took; will take
D.
will take; have taken
【单选题】—This is the first time I __________ my first picture with my own hands. —It's time that you __________ a picture for me.
A.
took; will take
B.
have taken; took
C.
took; took
D.
will take; have taken
【简答题】与同容量的变压器比较,感应电机的空载电流较大,为什么?
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