FX2N-64MR型PLC其型号中字母R的含义（）。
A、继电器输出
B、晶体管输出
C、双向晶闸管输出
D、单结晶体管输出
参考答案：A
The manager is said to have arrived back from Paris where he ______ some European partners.[ ]
A. would meet
B. is meeting
C. meets
D. had met
患者痈证日久，出现明显的肾虚症状，宜选方为
A．六味地黄丸B．大补元煎C．左归丸D．右归丸E．河车大造丸
