在JL465Q5发动机装配中，如配连杆轴瓦，需要依据（）分组号确定连杆轴瓦分组号
A.曲轴
B.连杆
C.活塞
D.缸体
参考答案：A, B
He waited with his companion_________the rescuers came, and then helped them carry her back down the mountain.
A．when
B．until
C．unless
D．while
社区卫生服务基本原则，除（）以外。
