对于钻井队钻机防碰天车装置，钻台大班负责安装、保养、拆卸、存放，（）负责岗位检查、使用及日常维护，（）负责监督管理。
参考答案：司钻；HSE监督
Which of the following statements about a monopolist is least accurate（）
A. The monopolist faces a downward sloping demand curve.
B. Unlike an oligopolist, a monopolist will always be able to earn economic profit.
C. A profit-maximizing monopolist will expand output until marginal revenue equals marginal cost.
患者，女，28岁。心内烦热，睡眠欠佳，常有口渴，舌红，脉细数。首选药物是（）
A.麦冬
B.女贞子
C.墨旱莲
D.杜仲
E.续断
