在任何情况下使用血液及血液制品，必须对病人或者家属进行输血风险教育，并在其知情同意并签署“医疗用血志愿书”后方可施行。
参考答案：错
There were so many cars held up by the heavy rain on the road that we had no but to wait. [ ]
A. alternative
B. difference
C. relation
D. opposition
我国对外经济技术无偿援助的物质出口，免领出口许可证。( )
