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【简答题】
如图所示为霍尔效应实验的接线原理图中,B的方向垂直于纸面朝里,电压表、工作电流的图所示,所以判断该霍尔片是 ( ) 型半导体材料。
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举一反三
【单选题】298K 时氨水的 K b Ɵ =1.8×10 -5 ,溶液中 [OH - ]= 2.40×10 -3 mol·L -1 ,则氨水的浓度 (mol·L -1 ) 是 ( )
A.
0.32
B.
0.18
C.
3.20
D.
1.80
【单选题】A small plane crashed into a hillside five miles east of the city, ________ all four people on board.
A.
killed
B.
killing
C.
kills
D.
to kill
【单选题】.A small plane crashed into a hillside five miles to the east of the city, _____ all on board.
A.
killed
B.
killing
C.
kill
D.
to kill
【单选题】A small plane crashed into a hillside five miles east of the city, _________ all the four people on board.
A.
killed
B.
killing
C.
having killed
D.
to kill
【单选题】The hospital is _____ five miles from the station. [ ]
A.
approximately
B.
appreciating
C.
appropriate
D.
applying
【单选题】I think Class Five ________ likely to win in the match because Class Five ________ all basketball lovers. [ ]
A.
is; are
B.
are; are
C.
is; is
D.
are; is
【单选题】A small plane crashed into a hillside five miles east of the city, ________ all four people on board.
A.
killed
B.
to kill
C.
kills
D.
killing
【简答题】Five miles ______ (seem)to be a long way to an old lady of her age．
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