乙醇汽油系统主要设备设施包括（）、乙醇系统、在线调和系统。
参考答案：组分油系统
With economy developing at great speed, our city has _____ quite a few changes in recent years.
A．witnessed
B．accumulated
C．arisen
D．introduced
地方性甲低"神经型"的临床表现中错误的是
A．智力低下严重
B．弛缓性瘫痪
C．聋哑
D．甲状腺功能可正常
E．身材可正常
