【单选题】One reason that the quantity demanded of a good tends to rise as its price falls is that:
A.
the decrease in price shifts the supply curve downward.
B.
people feel a bit richer and increase their use of the good.
C.
demand has to rise to restore equilibrium after a price reduction.
D.
suppliers are willing to supply more at lower prices.
E.
the decrease in price shifts the demand curve upward.
【单选题】部分多旋翼飞行器螺旋桨加有外框,其主要作用是
【判断题】Flat file databases are very simple.
【单选题】如果多旋翼飞行器安装的螺旋桨与电动机不匹配,桨尺寸过大,会带来的坏处不包括
【单选题】多旋翼飞行器是以哪种方式实现对飞行器的控制( )
【单选题】The average price of milk products is expected to rise considerably in the next month due to the_____costs a ssociated with dairy farming.
【单选题】如果多旋翼飞行器安装的螺旋桨与电动机不匹配,桨尺寸过大,会带来的坏处不包括