依据规模、效益、实施后果来衡量水利工程和水工建筑物的重要性,水利水电枢纽工程共分()等。
A.3
B.4
C.5
D.6
参考答案:C
请仔细阅读下列短文并改正其中的10个错误。
Recently, students in our class have had a discussion on whether space is worthy exploring.
30% of us thinks space exploration is not worthwhile. They think space is so far away from us and our daily life. And the money spending on space exploration can be used to solve the earth problems such as starvation and pollution.
In the other hand, 70% think that space worth exploring because we have benefited a lot for it, such as using satellites for communication and to weather forecast. What’s more, with further space research, we may solve the population problem by moving to other planets one day. Also, space research will enable us to find new sources to solve the problem of energetic shortages on the earth.
有关上颌骨解剖特点及临床意义的描述,下列哪项是错误的()
A.形态不规则,并与多数邻骨相连
B.受外力打击时,力量通过邻骨分散,不易骨折
C.若打击力过重,则上颌骨常与邻骨同时发生骨折
D.上颌骨骨折因受强大肌肉牵引导致移位
E.血运丰富,骨折后愈合较快