促进以高校毕业生为重点的青年就业和（）。
A、农村转移劳动力
B、城镇困难人员
C、应届毕业生
D、退役军人就业
参考答案：A, B, D
________arriving in Tibet , the soldiers at once joined them ____their work.
At; with B. On; in C. For; with D. After; to
等效应力有何特点？
