噪声、振动、电离辐射、电磁辐射属于
A.行为危险因素B.物理性危险因素C.医疗卫生服务中的危险因素D.生物性危险因素E.生物遗传危险因素
参考答案:B
68160÷320-13=200 [ ]
If I _____, I will go to the tea party this evening. [ ]
A. invite
B. invited
C. will invite
D. am invited