PN结的还有哪些称谓（）。
A. 空间电荷区
B. 耗尽层
C. N区
半导体的导电特性有（ ）。
A. 反向特性
B. 掺杂性
C. 热敏性
D. 光敏性
Which of the following four sentences is concise.
A. The reason why most of the country shifts to daylight savings time is that winter days are much shorter than summer days.
B. There were pine trees that stood like giants.
C. The intention of the company was to expant its workforce.
D. The company proposed to diversify the background and abilities of employees.
Two of the following are complete sentences. please pick them up.
A. Dream of Red Mansion Is the best-known novels.
B. The greatest danger that a species faces in a rapidly coevolving ecosystem.
C. This problem can be effectively solved only in this way.
D. The encouragement from the tutor had a great effect on him that he worked harder.
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