Ⅱ型呼吸衰竭的动脉血气分析特点是()
A.PaO≤60mmHg
B.PaCO正常
C.PaCO≥50mmHg
D.PaCO减低
E.PaCO≤50mmHg
参考答案:A, C
水溶性薄膜衣料()
A.卵磷脂
B.单硬脂酸丙二酯
C.黄原胶
D.聚山梨酯60
E.聚乙二醇
I wonder how it ________ that they made such rapid progress.
A.came about
B.came out
C.came on
D.came up