生理性第二心音分裂常见于
A.浮肋B.肋脊角C.胸骨角D.腹上角E.肩胛下区
参考答案:A
— It’s thirty years since we last met.
— But I still remember the story, believe it or not, ______ we got lost on a rainy night. [ ]
A. which
B. that
C. what
D. when
所有工作站全部黒屏,正确处理的方法是()。
A、启用进料低流量保护
B、启用两器切断保护
C、启用主风低流量保护
D、启用增压机保护