【单选题】维普数据库中期刊学科分类导航分为5个大类,不包括( )
【单选题】The income elasticity of demand is defined as the percentage change in ________.
A.
the quantity demanded resulting from a given percentage change in price
B.
income divided by the percentage change in quantity demanded
C.
the movement along the demand curve resulting from a change in income
D.
the quantity demanded divided by the percentage change in income
【单选题】已知 K (PbI 2 ) 和 K ([PbI 4 ] 2- ) ,则反应 PbI 2 +2I - [PbI 4 ] 2- 的标准平衡常数 K = ()。
A.
K ([PbI 4 ] 2- )]/[ K (PbI 2 )
B.
K (PbI 2 )]/[ K ([PbI 4 ] 2- ) ;
C.
K (PbI 2 ) · K ([PbI 4 ] 2- )
D.
1/[ K (PbI 2 ) · K ([PbI 4 ] 2- )]
【单选题】一成人旅客携带身高1米儿童两名,1.42米儿童一名要求使用三个卧铺办理时应核收( )。
【多选题】在共发射极、共基极、共集电极三种基本放大电路中,以下叙述是正确的 。
【单选题】医学道德是一种职业道德,对此下列叙述不正确的是
【单选题】The cross elasticity of demand is calculated as the percentage change in the ________.
A.
quantity demanded of one good divided by the percentage change in the price of another good
B.
price of one good divided by the percentage change in the quantity demanded of another good
C.
quantity demanded of one good divided by the percentage change in the quantity demanded of another good
D.
price of one good divided by the percentage change in the price of another good.