补体参与技术对不能激活补体的IgA、IgE及IgD类抗体的循环免疫复合物不能检测出。()
参考答案:对
A.先向A、后向B、再向A、又向B运动,4秒末在原位置且速度为零
B.先向A、后向B、再向A、又向B,4秒末在偏近A的某点且速度为零
C.先向A、后向B、再向A、又向B,4秒末在偏近B的某点且速度为零
D.一直向A运动,4秒末在偏近A的某点且速度为零
. My pain ___________ obvious the moment I walked into the room, for the first man I met asked me pitifully:" Are you feeling all right?"
A.must be
B.must have been
C.could be
D.could have been