心脏超声检查最常用的探头是
A.线阵探头B.凸阵探头C.TEE探头D.相控阵探头E.矩阵探头
参考答案:D
一台电脑原价5000元,现在打八折出售,现价每台______元.
I can't believe what he says because he is _______ changing his mind. .
A.regularly
B.steadily
C.suddenly
D.constantly