当洞口可能出现地层滑坡时应采取的预防措施有()。
A、地表锚杆;
B、深基桩;
C、挡墙;
D、防落石棚;
E、土袋或石笼;
F、平衡压重填土。
参考答案:A, B, C, E
There's a big difference between saying you'll do something and doing it.
A.actually
B.frequently
C.gradually
D.certainly
满足左心房肥大的标准应是()
A.P波时限>0.10秒
B.PⅠ、Ⅱ、aVL有切迹,P波时限>0.12秒
C.PⅠ、Ⅱ、aVL高尖
D.V.的正向P波振幅>0.15mV
E.P波有切迹