【判断题】因为 N 型半导体的多数载流子是自由电子,所以它带负电 。
【判断题】对齿轮泵而言,因为径向力不平衡产生的从动齿轮径向磨损大,主动齿轮径向磨损小。
【判断题】因为N型半导体的多数载流子是自由电子,所以N型半导体带负电。
【判断题】因为N型半导体的多数载流子是自由电子,所以带负电。
【单选题】which of the following is not the step of the selection of expatriates?
A.
evaluate the candidate’s personal traits
B.
the decision should be granted by the committee
D.
face to face interview
【单选题】The selection of Jurors may not be determined by______.
B.
the lawyers of both parties
D.
the defense and the prosecution
【单选题】The selection of a lubricating oil depends to a great extent on the operating conditions, _____.
B.
the design of the engine
C.
the type of fuel to be burned
【单选题】It can be inferred that the criterion/criteria for the selection of qualified candidates is/are ______.
A.
the qualification of the applicants
B.
the quality of the applicants' papers
C.
the number of the papers presented
D.
the abstract of the papers submitted
【单选题】Who would decide the selection of music for each film program in the past?
A.
The pianist of the orchestra,
D.
The conductor of the orchestra.