把命题“同角的余角相等”改写为“如果……，那么……”形式是（    ）。

A client undergoes a total laryngectomy and tracheostomy formation. On discharge, which instruction should the nurse give to the client and family

A．"Clean the tracheostomy tube with alcohol and water. "

B．"Family members should continue to talk to the client. "

C．"Oral intake of fluids should be limited for 1 week only. "

D．"Limit the amount of protein in the diet. "