加重钻具小车移动时，人员如何站位？
参考答案：加重钻具小车移动时，人员应远离轨道，防止压脚。
女性，61岁。由于急性广泛前壁心肌梗死发病12小时合并心力衰竭收入院进一步治疗，首选治疗心力衰竭的药物应是（）
A.洋地黄
B.血管扩张剂
C.利尿剂
D.β受体阻滞剂
E.钙离子拮抗剂
The atmosphere in a tank is too lean if it is（）.
A.incapable of supporting combustion because the hydrocarbon content is below the LFL (Lower Flammable Limit)
B.capable of supporting combustion because the hydrocarbon content is above the UFL (Upper Flammable Limit)
C.capable of supporting a fire once started
D.not safe for ballasting
