题目内容
关系模式分解的等价性标准主要有两个，它们是分解具有无损连接性和分解 【18】 。
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In 1959 the (41) American family paid $ 989 (42) a year’ s supply of food. In 1972 the family paid $1 311. That was a price (43) of nearly one-third. Every family has (44) this sort of experience. Everyone agrees that the cost of (45) a family has risen sharply. But there is less agreement (46) reasons for the rise are being discussed. Who is really (47) Many blame the farmers who (48) the vegetables, fruit, meat, eggs and cheese (49) stores offer for (50) . According to the U.S. Department of (51) , the farmer’s share of the $ 1 311 spent by the family in 1972 was $ 521. This was thirty-one percent (52) than the farmer had received in 1959. But farmers claim that this increase was very small (53) to the increase in their cost of (54) . Farmers tend to blame others for the sharp (55) in food prices. They particularly blame those who (56) the farm products after the products leave the farm. These (57) truck drives, meat packers, manufacturers of packages and other food containers, and the (58) of stores where food is sold. They are among the "middlemen" who stand (59) the farmer and the people who buy and eat the food. (60) middlemen the ones to blame for food price
与牙弓咬合平面大致平行，维持牙齿直立，对抗侧方力
液体软炒菜水分含量大，所以应用大火烧炒。( )
In 1959 the (41) American family paid $ 989 (42) a year’ s supply of food. In 1972 the family paid $1 311. That was a price (43) of nearly one-third. Every family has (44) this sort of experience. Everyone agrees that the cost of (45) a family has risen sharply. But there is less agreement (46) reasons for the rise are being discussed. Who is really (47) Many blame the farmers who (48) the vegetables, fruit, meat, eggs and cheese (49) stores offer for (50) . According to the U.S. Department of (51) , the farmer’s share of the $ 1 311 spent by the family in 1972 was $ 521. This was thirty-one percent (52) than the farmer had received in 1959. But farmers claim that this increase was very small (53) to the increase in their cost of (54) . Farmers tend to blame others for the sharp (55) in food prices. They particularly blame those who (56) the farm products after the products leave the farm. These (57) truck drives, meat packers, manufacturers of packages and other food containers, and the (58) of stores where food is sold. They are among the "middlemen" who stand (59) the farmer and the people who buy and eat the food. (60) middlemen the ones to blame for food price
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