当今我国预防医学研究的对象是()。
A.致病因素的高危人群
B.对疾病抗力弱的人群
C.有职业致病因素接触的人群
D.低收入、无医疗支付能力的人群
E.全社会的人群
参考答案:E
铸造支托的厚度()
A.0.5mm
B.1mm
C.1~1.5mm
D.2mm
E.2.5mm
This year an increased number of drivers ________ for overspeeding.[ ]
A. have punished
B. have been punished
C. has punished
D. has been punished