选择题：With a lot of difficult problems _____, the newly-

题目内容：
With a lot of difficult problems _____, the newly-elected president is having a hard time. ( )(本题2.5分)
A、 settled
B、 settling
C、 being settled
D、 to settle
参考答案：

12.能把转动运动转变成往复摆动运动。(本题2.0分)A. 曲柄摇杆机构B. 双曲柄机构C. 双摇杆

12.能把转动运动转变成往复摆动运动。(本题2.0分)A. 曲柄摇杆机构B. 双曲柄机构C. 双摇杆机构D. 曲柄滑决机构

分类：西安石油大学-石油工程技术-大学英语I（上）  题型：选择题
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