任意两条无差异曲线不能相交，否则交点的效用无法判断。
参考答案：错
The Titanic, the biggest ship of its day, ____ unsinkable, but it sank on its first voyage in 1912.
A．thought
B．was thought
C．thought it
D．was thought it
下列治法除哪项外均为脱疽治法：
A．清热利湿
B．温阳通脉
C．活血祛瘀
D．调补气血
E．祛寒化湿
