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【单选题】
一半导体薄片置于如图所示的磁场中,薄片中电流的方向向右。试判断上下两侧的霍尔电势差:A.
电子 导 电，V a V b ；
B.
电子导电， V a V b
C.
空穴导电，V a >V b ；
D.
空穴导电，V a =V b
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【单选题】Music _________ by the British musician attracts music lovers all over the world.
A.
to write
B.
to be written
C.
written
D.
writing
【简答题】Read the passage.Match each function of a PDM system in the left colum the the things it can achieve in the right colum.
【判断题】Applicaiton of a PDM system in mold design can help the users to ensure the quality of their products.
A.
正确
B.
错误
【判断题】A PDM system can help mold designers find existing mold designs that are similar to the project at hand.
A.
正确
B.
错误
【单选题】【2019·江苏】 The musician along with his band members ___________ ten performances in the last three months.
A.
gives
B.
has given
C.
have given
D.
give
【简答题】Read the passage. Match each function of a PDM system in the left column with the things it can achieve in the right column.
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