Bed material samplers, as first developed , may be divided into three types.最初的河床质取样器有三种类型.In this paper the performance of two kinds of samplers sintered metal filter is evaluated.本文介绍温、湿度变化对两种改进型被动式活性炭累积氡采样器吸附性能的影响....
他选择了攻读耶鲁大学的经济学硕士学位。He took a master's degree in economics at Yale.该课程比硕士学位课程更注重实践。The course is more practically based than the Masters degree.我拿文科硕士学位其实就是觉得好玩儿。I took my M. A. just for fun really....