下列那种抗原不是颗粒性抗原
A．伤寒杆菌
B．红细胞
C．细菌外毒素
D．金黄色葡萄球菌
E．抗原包被的乳胶微粒
参考答案：C
His joke went too far. It was more than I could_________ .
A．get rid of
B．put up with
C．keep up with
D．do away with
时分复用的英文缩写是（）。
A.TDM
B.FDM
C.TDMA
D.FDMA
