【简答题】100mL0.3mol·L -1 Na 2 SO 4 溶液和50mL0.2mol·L -1 Al 2 (SO 4 ) 3 溶液混合后,溶液中SO 4 2 - 离子的物质的量浓度(设体积为二者之和)为( ) A.0.2mol?L -1 B.0.25 mol?L -1 C.0.4 mol?L -1 D、0.5 mol?L -1
【简答题】SECTION B ENGLISH TO CHINESE Directions: Translate the following text into Chinese. Possession for its own sake or in competition with the rest of the neighborhood would have been Thoreau's idea of th...
【单选题】如果小区半径D=35km,用面状服务区组网时,可用的最小区群大小为( )。
【判断题】调质处理是淬火加低温回火的复合热处理方法。
【单选题】100mL 0.3mol·L -1 Na 2 SO 4 溶液和50mL 0.2mol·L -1 Al 2 (SO 4 ) 3 溶液混合后,溶液中SO 4 2- 的物质的量浓度为( )
【单选题】According to the author, what can be a regular source of money provided for us?
【单选题】下列溶液中Al 3+ 的浓度与50 mL 1 mol·L -1 的Al 2 (SO 4 ) 3 溶液中的Al 3+ 浓度相等的是( )
A.
100 mL 1 mol·L -1 AlCl 3
B.
75 mL 2 mol·L -1 Al(NO 3 ) 3
C.
50 mL 3 mol·L -1 AlCl 3
D.
25 mL 2 mol·L -1 Al 2 (SO 4 ) 3
【单选题】-Is the young man standing at the gate_____ the car? -No. The car is _____ his father.
A.
in possession of ;in the possession of
B.
have possession of; take possession of have possession of; in the possession of D. in the possession of; take possession of