【多选题】在独立方案中,选择某一个方案并不排斥选择另一个方案。就一组完全独立的方案而言,其存在的前提条件有( )。
【单选题】The balance of payments used to indicate the long-term trend of a country's balance of payments is ( ).
A.
Trade balance of goods
C.
Current account balance
D.
Official settlement balance
【简答题】在琼脂糖凝胶电泳过程中,混合物里分子量和分子形状相同的粒子,带电量越( ),泳动速度越慢。
【单选题】An improvement in a country's balance of payments means a decrease in its balance of payments deficit, or an increase in its surplus. In fact we know that a surplus in a balance of payments
B.
is usually beneficial.
【单选题】An improvement in a country's balance of payments usually means a decrease in its balance of payments deficit, or an increase in its surplus. In fact we know that a surplus in a balance of payments ( ...
【简答题】分子量和分子形状相同的粒子,带电量越 ,泳动速度越慢。
【单选题】An improvement in a country's balance of payments means a decrease in its balance of payments deficit, or an increase in its surplus. In fact we know that a surplus in a balance of payments
B.
is usually beneficial.
【多选题】马里奥特庭院饭店的品牌策略的优点有()。