单选题：依据WH0提出的癌症三级止痛阶梯治疗方案正确的是

题目内容：

依据WH0提出的癌症三级止痛阶梯治疗方案正确的是 A．最初用吗啡类药
B．以注射给药为主
C．效果不明显时。换用非吗啡类药
D．从小剂量开始．视止痛效果渐增量
E．根据疼痛发作与否非定期给筠

参考答案：

答案解析：

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