委托人在受托人按其委托要求成交后，必须如期履行交割手续，否则即为违约。( )
参考答案：对
Being able to speak another language fluently is a great________when you're looking for a job.[ ]
A．chance
B．success
C．effort
D．advantage
试分析直接水冷发电机漏水的主要原因有哪些？
