That's Ann and _____Paul. [ ]
A. it's
B. Those's
C. that's
D. she's
答案:C
在△ABC中,a2=b2+c2+bc,则A=( )
A.60°
B.45°
C.120°
D.30°
用于肺部分泌物引流时,可用何种卧位()
A.头高足低位
B.头低足高位
C.俯卧位
D.侧卧位
E.屈膝仰卧位