为使填料塔发挥良好的效能，填料应符合的要求有()。 A．要有较大的比表面积 B．要有

Today’’s lecture we’’ll center on the prehistoric people of Nevada Desert. Now most of these prehistoric desert people (36)______the countryside throughout the year. You might think that they’’re wandering aimlessly. Far from it, they actually followed the (37)______of carefully planned moves. Where they moved depended on where food was (38)______. Places where plants were ripening or fish were (39)______. Now often when these people moved, they carried all their (40)______on their backs. But if the journey was long, extra food and tools were sometimes stored in caves or (41)______rocks. One of these caves is now an exciting (42)______ site. Beyond its small opening is a huge underground (43)______. Even though the cave is very large. It was certainly too dark and dusty for the travelers to (44)____________. But it was a great place to (45)____________. And tremendous amounts of food supplies and artifacts have been found there.The food includes dried fish, seeds and nuts. The artifacts include stone spear points and (46)____________. The spear points are actually rather small. Here is a picture of some that were found. You can see their size in relation to the hands holding them.

下列关于义务性支出和选择性支出组合的说法，错误的是( )。

A．义务性支出——筹备子女大学学费；选择性支出——留遗产给子女

B．义务性支出——已有负债之本利摊还；选择性支出——居家重新装潢

C．义务性支出——续期保费支出；选择性支出——投资型保单增额保费支出

D．义务性支出——生活基本开销；选择性支出——现在不消费、储蓄起来投资运用

法的强制作用

需行气管插管和胸腔闭式引流术的是（）

A.单纯性肋骨骨折

B.多发性肋骨骨折

C.多发性肋骨骨折伴血气胸

D.开放性肋骨骨折

E.自发性气胸

预防营养不良最主要的措施是

A．预防各种感染性疾病

B．强调合理喂养

C．大力宣传科学育儿知识

D．安排良好的生活制度

E．及早纠正先天畸形