【简答题】关于电场强度的下列说法中正确的是( ) A .电场强度在数值上等于单位电荷在电场中所受的电场力 B .在电场中某点不放电荷,则该点的电场强度一定为零 C .正电荷在电场中某点所受电场力的方向就是这点电场强度的方向 D .负电荷在电场中某点所受电场力的方向就是这点电场强度的方向A.B.C.D. D
【单选题】Suppose the central bank purchases a government bond from a person who deposits the entire amount received from the sale in her bank, the money supply will
A.
rise by an amount that depends on the bank’s reserve ratio.
B.
rise by less than the amount of the deposit.
C.
fall by exactly the amount of the deposit as long as the bank does not change its reserve ratio.