不宜用于变异型心绞痛的药物是（）.
A．硝酸甘油
B．硝苯地平
C．普萘洛尔
D．维拉帕米
E．地尔硫
参考答案：C
东滩煤矿冲击地压防治实施细则规定（）和（）在总工程师领导下具体开展冲击地压的防治工作。
A project management team has subcontracted work to a service company．Which of the following tools is the best choice to assure that this company will be able to meet the quality requirements of the project ？（）
A．Quality audi
B．Deliverable inspectio
C．Fixed price contrac
D．Service level agreemen
