【单选题】Mr. Smith became very ______ when it was suggested that he had made a mistake.
【单选题】液压缸的种类繁多,()可作为双作用液压缸
【多选题】液压缸的种类繁多,( )可作双作用液压缸 。
【多选题】液压缸的种类繁多,( )可作双作用液压缸。
【多选题】液压缸的种类繁多,( )可作双作用液压缸 。
【单选题】卤代烃1 2 3 发生SN2反应时,速率的快慢顺序为 A.1>2>3 B.2>3>1 C.2>1>3 D.3>2>1