下列涎腺疾病中有自愈倾向的是
A．舍格伦综合征B．坏死性涎腺化生C．慢性涎腺炎D．慢性复发性腮腺炎E．慢性硬化性颌下腺炎
参考答案：B
下列有关种群、群落的叙述，正确的是[ ]
A．稳定型的种群个体数量在近期内保持不变
B．捕食关系对维持群落的相对稳定有重要作用
C．植物群落的水平分布与地形无关
D．人类活动不会改变群落演替的方向和速度
Which nursing action is most effective in defusing a client’s impending violent behavior（）
A. Helping the client identify and express feelings of anxiety and anger.
B. Involving the client in a quiet activity to divert attention.
C. Leaving the client alone until he can talk about his feelings.
D. Placing the client in seclusion.
