支气管扩张的主要病因是
A.支气管-肺组织感染和支气管阻塞
B.先天发育障碍
C.遗传因素
D.机体免疫功能失调
E.全身疾病
参考答案:A
根据上句完成下句,使两句表达的意思基本相同,每空一词。
1. Emma is like her aunt.
Emma and aunt ________ ________ ________.
2. How old is Lena?
________ Lena's ________?
3. Jack is Lily's good friend.
Jack and ________ ________ good ________.
4. They usually get to school at 8 o'clock.
They usually ________ ________ school at 8 o'clock.
5. Can I help you?
________ can I ________ ________ you?
生产尾期检验一般安排在全部完成订单的成品生产后进行。