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【多选题】
以下有关评估助听听阈操作的注意事项说法正确的是()。
A.
定期校准听力计，常规要求每次进行声场测试之前都要按要求校准声场
B.
声场要定期进行校准，如果声场内的摆设发生变化或者测试音异常，要随时进行校准
C.
测试时双方的手机不必关闭
D.
测试人员要向家长解释清楚测试内容和目的，与受试者建立友好关系消除其紧张情绪
E.
测听室内温度要适宜，否则会影响受试者的情绪，影响测试结果
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相关题目：
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B.
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C.
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