当管道内所输送的气体温度达到易熔（）片的熔化温度时，易熔片熔断，防火阀开始动作。
A、塑料
B、金属
C、玻璃
D、聚四氟乙烯
参考答案：B
Come on, Maria! You can also enjoy_______ you have been dreaming of if you don’t lose heart.
A．as convenient a life as
B．as a convenient life as
C．as a life convenient as
D．convenient as a life as
证券公司应当与接受委托的证券经纪人签订委托合同，证券经纪人即可独立自由地开展工作。( )
