上唇系带粗大不能自行萎缩最易引起的错畸形是()
A.前牙反
B.深覆盖
C.上中切牙间隙
D.深覆
E.上前牙拥挤
参考答案:C
Early this year, thousands of migrant _______ workers cancelled their insurance due to the lack of _______ policy to transfer insurance between difference regions.
A.the; the
B.the; a
C./; the
D./; a
监护仪测量呼吸频率最简单、常用的方法是()。
A.呼气末CO2法
B.吸气末O2法
C.阻抗法
D.比色法