1.2,3,0.6,0.4,0.45,5
异物被吸入气管后,最先发生的症状是()
A.呼吸困难
B.剧烈呛咳、憋气、面色青紫
C.肺听诊啰音、哮鸣音
D.听诊声门下拍击音
E.心力衰竭
We've tested three hundred types of boots, none of______is completely waterproof.
A.which
B.that
C.what
D.them