气轮机将蒸汽的热能转变为机械功通常是通过（）作用原理实现的。
A、惯性力
B、冲动和反动
C、静力学
D、牛顿第三定律
参考答案：B
The government（）to approve the use of wide-spread surveillance when the Justice Department took objections.
A. is going
B. had been
C. was about
D. is coming
宫颈癌淋巴转移二级组为（）
A.闭孔淋巴结
B.髂内淋巴结
C.髂外淋巴结
D.宫旁淋巴结
E.腹主动脉旁淋巴结
