治疗中度至较重癌痛可选择（）
A.美沙酮
B.纳络酮
C.可待因
D.阿司匹林
E.氯吡格雷
参考答案：C
对吹-灌-封三合一挤出螺杆的材质有何要求？
Eddie is eight years old, but we have seven candles only, we need ________ candle.
A．Only one
B．one more
C．some more
D．one much
