【简答题】设有连续方式偿还的n年期贷款,时刻t的偿还额为t,给出未结贷款余额的计算式.
【单选题】银行贷款分为一次性还清贷款和分期偿还贷款的依据是( )。
【单选题】( )是江西景德镇瓷器制造业的黄金时代。
【简答题】John often attends public lectures at the University of Oxford, chiefly ________ his English. A) to improve B) improving C) to have improved D) improved
【单选题】John often attends public lectures at the University of Oxford, chiefly _______his English.