一条小路长25.12米，小明在小路上滚铁环，铁环直径为40厘米，从小路的一端滚到另一端，铁环要转多少圈？
25.12×100÷（3.14×40）=20（圈）
As a project manager, you are interested in the personal activities of team-members. Other than working with you on the project, the team members love to go out with you for lunch or an occasional game of golf. The power of the team members is ______ .
A．penalty
B．expert
C．legitimate
D．referent
在进行俯卧压背人工呼吸时，抢救者身体向前倾，借助自身重量压迫伤员（），并且压迫腹部横隔上升，形成呼吸气，使其吐出水和其它分泌物。
A、胸廓
B、臀部
C、腰部
