【单选题】When there is a shortage in a market,
A.
there is downward pressure on price.
B.
there is upward pressure on price.
C.
the market could still be in equilibrium.
D.
the price must be above equilibrium.
【判断题】药物吸收的速度和程度影响药物起效的快慢和强弱。
【单选题】When there is a surplus in a market,
A.
there is upward pressure on price.
B.
there is downward pressure on price.
C.
the market could still be in equilibrium.
D.
there are too many buyers chasing too few goods.
【简答题】二极管正向偏置时,其正向导通电流注意主要由 的扩散运动形成。