接种流感疫苗应注意()
A.在冬季注射
B.每2年加强注射一次
C.根据流行病学调查结果选择不同亚型疫苗
D.对鸡蛋过敏者为禁忌症
E.肌肉注射
参考答案:C, D
When it appears that a design error will interfere with meeting technical performance objectives, the PREFERRED response is to ______ .
A) decrease the performance value to equal the assessed valueB) develop alternative solutions to the problemC) increase the specified value to set a new performance goalD) reduce the overall technical complexity of the project
与X线照片产生灰雾的原因无关的是
A.胶片本底灰雾B.焦点外X线C.显影处理D.被检体产生的散射线E.胶片最大密度