【单选题】为了使JavaBean可以被其他类访问,类的属性一般定义为_____________ 。
【单选题】已知 PbCl 2 、 PbI 2 和 PbSO 4 的溶度积各为 1.6×10 - 5 、 8.3×10 - 9 和 1.6×10 - 8 。向浓度均为 0.10mol/L 的 Cl - , I - , SO 4 2- 混合溶液中滴加 PbNO 3 , PbCl 2 、 PbI 2 和 PbSO 4 这三个沉淀析出的先后顺序是( )
A.
PbCl 2 、 PbI 2 、 PbSO 4
B.
PbSO 4 、 PbI 2 、 PbCl 2
C.
PbI 2 、 PbSO 4 、 PbCl 2
【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
【多选题】第二次世界大战后出现了人类历史上影响深远的全面的技术革命,以( )为主要标志
【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( )。
【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.