【单选题】Why does the professor prefer these particular days for the tutorial?
A.
The students prefer these days the most.
B.
The course runs from Monday to Wednesday.
C.
He likes to control every detail of the course.
D.
He is out of town these particular days each week.
【单选题】对功的概念有以下说法,正确的是:( )
B.
质点运动经一闭合路径,保守力对质点做功为零;
C.
作用力和反作用力大小相等、方向相反,所以两者所做功的代数和必为零;
【单选题】当温度升高时, BJT 集电极电流 ______ 。
【单选题】当温度升高时, BJT 集电极电流 ______ 。
【单选题】当温度升高时, BJT 集电极电流 ______ 。
【单选题】主张应该尽可能迅速地做出决策的决策者的个人风格是()
【单选题】当温度升高时,BJT集电极电流______。