频谱多普勒对检测血流的用途是()
A.精确测定血流宽度
B.测定血管壁的厚径
C.确定血流方向
D.确定是什么脏器的动脉血管
E.可单独测定血流量
参考答案:C
—It’s not easy _________Mrs White to persuade(劝说)her husband to stop smoking. He never listens to others.
—Really? It’s stubborn ____________ him.
A.of; of
B.for; of
C.for; for
D.of; for
In the old town of Lijiang, foreign people are everywhere_______ in bars.
A.sat around
B.sitting around
C.talking with
D.talked with