【简答题】四冲程汽油发动机每完成一个工作循环需要经过________、________、________和________4个过程,曲轴旋转_______周。
【多选题】指导教师应从以下( )方面评定成绩:
B.
观察、收集、整理、查阅资料的能力及运用水平。
C.
独立工作能力、动手能力和分析解决问题的能力。
【单选题】当PN结外加正向电压时,扩散电流()漂移电流,产生正向电流,PN结导通;当PN结外加反向电压时,扩散电流()漂移电流,产生很小的反向饱和电流,PN结截止。
【单选题】According to the last two paragraphs, Spindler believes that
A.
dieting is not a good method to give us health and a long life.
B.
seeing the effect of a diet, people will eat less than normal.
C.
calorie restriction is very important to young people.
D.
drugs do not have the effects of calorie restriction.
【多选题】指导教师应从以下( )方面评定成绩。
B.
观察、收集、整理、查阅资料的能力及运用水平。
C.
独立工作能力、动手能力和分析解决问题的能力。
【单选题】Which of the following does the author use most to convince readers of the FBI s new method?
【单选题】One major difference between the look-say method of learning reading and the phonies method is ______ .
B.
Phonics takes longer to learn
C.
look-say is easier to teach
D.
phonics gives readers access to far more words
【简答题】当 PN结外加正向电压时,PN结_ _ _,结电阻很小,正向电流较大;当PN结外加反 向电压时, PN结截止,结电阻很大,反向电流很小。这种导电特性叫做 。