在职业性疾病的研究中,由健康工人效应带来的偏倚是()。
A.检出症候偏倚
B.易感性偏倚
C.失访偏倚
D.报告偏倚
E.领先时间偏倚
参考答案:B
第一节语音知识(共5小题,每小题1分,满分5分)从 A、B、C、D四个选项中,找出其划线部分与其所给单词的划线部分读音相同的选项.
1. mean A stream B break C great D real
2. southern A thought B about C through D trouble
3. healthy A. their B. this C. teeth D. northern
4. many A. trade B. sad C anything D. taste
5. stomach A. school B. church C. machine D. change
简述停止湿式搅拌机的操作过程?