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利润分配上的资本保全约束是为了维护投资者的利益。 ( )
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[听力原文]11-15(Q11)All mammals, except man and the monkey, swim naturally from birth. For mall, like the monkey, it is not instinctive to float. Deaths by drowning are common everywhere. (Q12)In the United States alone, about 7,000 children under four drown each year. Everything possible is done to prevent such tragedies. (Q13)One solution that is particularly effective is to teach children to swim while they are still babies. Most large towns in Florida and California already run lessons for babies and infants. (Q14)The idea has spread to Europe where, in several countries, special courses are now arranged for children from seven to twenty-four months. (Q15)The first step is to eliminate the child’s fear of the water, Next, he’s taught to float. Once he can do this naturally and without fear, the child grasps the technique and can push forward himself through the water. What’s the second step to teach a child to swimAt the second step, the child is taught to（）.
A—profit marginB—trade markC—seaworthy export packingD—certificate of originE—quality as per buyer’s sampleF—export declarationG—procedure of arbitrationH—risk of contaminationI—settlement on accountJ—retail priceK—find a ready marketL—enjoy popular pricesM—settle accountN—export licensing positionO—be in a position to do sth. 出口许可证情况（）仲裁程序
肩关节正位摄影，中心线射入点是
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