稳定型心绞痛发作时的治疗选用（）稳定型心绞痛缓解期的治疗选用（）
A. 阿司匹林
B. 硝酸甘油
C. 低分子肝素
D. 氯贝丁酯
E. 阿昔单抗
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Frapping lines are fitted to lifeboat davits to（）.
A. reduce the swinging of the lifeboat as it is being lowered from the embarkation level
B. secure the lifeboat in the davits when in the stowed position
C. hold the lifeboat to the ship's side until the tricing lines are passed
D. be used as a safety line in an emergency
白云石的主要成分是碳酸钙和（），理论上含CaO0.4%，MgO21.7%，CO247.9%。
A. 二氧化硅
B. 碳酸镁
C. 氧化镁
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