采用（）方式，物料的受热时间最短。
A、离心薄膜浓缩
B、三效浓缩
C、双效浓缩
D、常压浓缩
参考答案：A
We tried to persuade him to change his mind, but he insisted that he had no ______ of doing so. [ ]
A. intention
B. preference
C. alternative
D. trend
骨盆截骨术截骨平面在（）。
A.髂前上棘部位
B.髂前下棘部位
C.髂前下棘下方
D.髂前上棘和髂前下棘之间
E.髋臼上缘
