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【简答题】
Listen to the passage and fill in the blanks with the missing words or phrases. John Wilson is the 1 of a big company. He is always very busy and travels a lot. He will be away for 2 all next week. He will visit several cities on his trip, have meeting with some managers from other companies, see a lot of 3 and listen to their reports. Mary is his 4 . And she won't go with him. She’s still in the office, answering John’s letters and telephones. Keeping contact with other companies and calling John to let him know about anything important. She’ll also be in charge of all the employees in the office. She wants to do a good job because she hopes to be 5 .
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参考答案:
举一反三
【单选题】在杂质半导体中,多数载流子的浓度主要取决于( )。
A.
杂质浓度
B.
杂质类型
C.
I型半导体
D.
温度
【简答题】妊娠 18-20 周有胎动:次数为 。
【简答题】杂质半导体中的多数载流子是由_________产生的,少数载流子是由_________产生的,在二极管中,多数载流子形成_________电流,少数载流子形成_________电流。
【判断题】轴、轴上零件及两端轴承支座的组合称为轴组
A.
正确
B.
错误
【简答题】tutorial 3月7日.mp4 Write comments on at least one group ’ s tutorial discussion
【判断题】轴、轴上零件及两端轴承支座的组合称为轴组。(1.0分)
A.
正确
B.
错误
【简答题】在杂质半导体中,多数载流子的浓度主要取决于_______,而少数载流子的浓度则与_______有很大关系。
【单选题】冬期施工中,钢筋冷拉可在负温下进行,但温度不得低于( )。
A.
-10℃
B.
-15℃
C.
-5℃
D.
-20℃
【判断题】轴、轴上零件及两端轴承支座的组合称为轴组。
A.
正确
B.
错误
【单选题】在杂质半导体中,多数载流子的浓度主要取决于(     )     。
A.
I型半导体
B.
杂质半导体
C.
温度
D.
杂质浓度
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