无效咳嗽的原因
参考答案:
①分泌物太浓稠;
②分泌物远离大支气管;
③呼吸肌无力;
④不能关闭声门
⑤吸人气体量太少;
--She is coughing and sneezing all the time.
--So ______you if you ______a cold. [ ]
A. will; have
B. would; had
C. will; had
D. might; had
用磷脂酶C处理完成的细胞,能释放出()。
A.跨膜蛋白
B.膜周边蛋白
C.脂锚定蛋白
D.糖蛋白