右心室有（）
A.梳状肌
B.动脉圆锥
C.主动脉前庭
D.二尖瓣
E.卵圆窝
参考答案：B
My English teacher's humor was ____ make ever student burst into laughter. [ ]
A. so as to
B. such as to
C. such that
D. so that
协同凝集试验的致敏载体为
A．胶乳颗粒
B．SRBC
C．O型人红细胞
D．金黄色葡萄球菌A蛋白
E．彩色胶乳颗粒
