快速充盈期在血流动力学上的意义是（）。 A.血液快速从左心室射到主动脉 B.血液从主

招标必须具备的基本条件：需按现行规定履行审批、核准、( )手续；有相应资金或资金来源已经落实。

A．购置

B．审查

C．编写

D．备案

物流服务商选择流程是（）。

A.初始准备一物流商初选和精选一识别潜在的物流服务商一建立物流商关系一物流商关系评估

B.初始准备一识别潜在的物流服务商一物流商初选和精选一建立物流商关系一物流商关系评估

C.初始准备一识别潜在的物流服务商一建立物流商关系一物流商初选和精选…+物流商关系评估

D.初始准备一识别潜在的物流服务商一建立物流商关系一+物流商关系评估一物流商初选和精选

Watch a baby between six and nine months old, and you will observe the basic concepts of geometry being learned. Once the baby has mastered the idea that space is three-dimensional, it reached out and begins grasping various kinds of objects. It is then, from perhaps nine to fifteen months, that the concepts of sets and numbers are formed. So far, so good. But now an ominous development takes place. The nerve fibers in the brain insulate themselves in such a way that the baby begins to hear sounds very precisely. Soon it picks up language, and it is then brought into direct communication with adults. From this point on, it is usually downhill all the way for mathematics, because the child now becomes exposed to all the nonsense words and beliefs of the community into which it has been so unfortunate as to have been born. Nature having done very well by the child to this point, having permitted it the luxury of thinking for itself for eighteen months, now abandons it to the arbitrary conventions and beliefs of society. But at least the child knows something of geometry and numbers, and it will always retain some memory of the early happy days, no matter what vicissitudes it may suffer later on. The main reservoir of mathematical talent in any society is thus possessed by children who are about two years old, children who have just learned to speak fluently.

Which of the following activities would teach a baby about geometry().

A. Picking up language.

B. Communicating with others.

C. Recognizing numbers.

D. Catching different objects.

颈部大静脉损伤出现严重的空气栓塞时的紧急处理是

A．结扎血管
B．吻合血管
C．右心室穿刺
D．损伤部位局部加压
E．气管插管

X线检查中，子骨多见于（）。

A.肩部

B.肘部

C.膝部

D.腰部

E.手、足部