右心衰体征不包括()
A.舒张期奔马律
B.颈静脉反流征阳性
C.水肿
D.肝脏肿大
E.三尖瓣杂音
参考答案:A
We usually take turns ______cleaning ,and today it is my turn ____it
A.to do; doing
B.doing; doing
C.doing ;to do
D.to do ;to do
与镍铬合金相比,铸造金-铂-钯合金的特点是()
A.密度低
B.铸造温度高
C.弹性模量高
D.硬度高
E.生物相容性好