上海证券交易所买断式回购风险控制措施包括( )。

A．履约金制度

B．仓位控制

C．质押库制度

D．标准券制度

In order to keep good friends together, we must, first of all, show respect to each other; there must not be any, however little, reluctance, interference or dominance involved. Should interest or temperament match, people tend to agree or become friends, or they part company and cease to be friends. You shall never go too far, disregarding manners, no matter what kind of close or intimate friends you are. Otherwise, that state of harmony and balance is sure to be upset and you are no longer friends. Generally, every one of us, as friends, still hopes to have a private room reserved for ourselves. By always having your own ways, you may risk intruding into that forbidden zone, causing conflict or estrangement. Though failing to show respect to friends only seems to be a trifle, it may turn out destructive in the future as if pre-destined. So the best solution for keeping good friends together is stick to showing manners as you see fit in everyday dealings and never meddle: always show respect to each other, and you’ll enjoy lasting friendship.