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问题 单项选择题 A1/A2型题

第5腰椎在腹前壁的体表投影位于（）

A.剑突水平

B.剑突下3cm

C.脐上3cm

D.脐水平

E.脐下3cm

答案

参考答案：E

解析：第5腰椎在腹前壁的体表投影位于脐下3cm同一平面。

单项选择题

For（1） service, we need a virtual-circuit subnet. Let us see how that works. The idea behind virtual circuits is to avoid having to choose a new （2） for every packet sent. Instead,when a connection is established, a route from the （3）machine to the destination machine ischosen as part of the connection setup and stored in tables inside the（4）That route is used forall traffic flowing over the connection, exactly the same way that the telephone system works.When the connection is released, the virtual circuit is also terminated. With connection-orientedservice, each packet carries an （5）telling which virtual circuit it belongs to.

（4）是（）

A.connections

B.resources

C.bridges

D.routers
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单项选择题

蛋白质是生命活动的主要承担者。下列不属于组成蛋白质的氨基酸是（）

A.A

B.B

C.C

D.D
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