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
