怀疑为先天性胸腺发育不全的患者，需做的是
A．EAC花环试验B．T细胞亚群检测C．溶血空斑试验D．免疫球蛋白检测E．EA花环试验
参考答案：B
The president, together with his bodyguards, ____ to the nuclear station ___ there was an accident
20 minutes ago. [ ]
A. have come, which
B. came, in which
C. has come, where
D. came, in where
低压煮沸有哪些优点？
