治疗癫痫持续状态的首选药物是()
A.苯妥英钠
B.苯巴比妥钠
C.硫喷妥钠
D.地西泮
E.水合氯醛
参考答案:D
A perfectly competitive firm will continue to increase output so long as which of the following conditions exists()
A. Marginal revenue is greater than price.
B. Marginal revenue is positive.
C. Market price is greater than marginal cost.
石膏的初凝时间为()
A.8~10分钟
B.8~16分钟
C.5~7分钟
D.16~20分钟
E.4~5分钟