标志着中共从幼稚走向成熟的会议是（）
A八七会议
B遵义会议
C瓦窑堡会议
D洛川会议
参考答案：B
硬膜外麻醉最严重的并发症是：
A．神经损伤
B．硬膜外腔出血
C．硬膜外腔感染
D．穿破硬膜
E．全脊椎麻醉
He the job well, but he so careless.
A．had done; had been
B．could do; was
C．could have done; was
D．hadn’t done; had been
