过△ABC所在平面a外一点P,作OP⊥a,垂足为O,连接PA,PB,PC, 若P

题型:填空题

问题:

过△ABC所在平面a外一点P,作OP⊥a,垂足为O,连接PA,PB,PC,

若PA=PB=PC,则点O为△ABC的            心。

考点:空间几何体的三视图
题型:填空题
已知椭圆的方程为2x2+3y2=m(m>0),则此椭圆的离心率为(  )
A.
1
3
B.
3
3
C.
2
2
D.
1
2
题型:填空题

Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

55().

A.displaying 

B.describing 

C.creating 

D.exchanging

题型:填空题

以下各项检查中,对确定膀胱肿瘤最可靠的是

A.B超

B.CT

C.经膀胱镜检查+活检

D.尿细胞学检查

E.膀胱双合诊

题型:填空题

张仓对历史的最大贡献是什么?

题型:填空题

左背部刀刺伤后持续低血压,应作处理()。

A.锁骨中线第二肋间隙作胸穿

B.腋中线第7~8肋间隙作胸穿

C.锁骨中线第5肋间隙作胸腔闭式引流

D.腋后线第7~8肋间隙作胸腔闭式引流

E.剖胸探查止血

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