根据下表所提供的信息回答问题：检查到的有不合格产品的建材企业占全国监督检查企业总数的

缺词填空。

     What must you do when you get a present for your birthday? You have to sit down and w    1   a

thank-note. The words "thank you" are very important. We have to use them very o   2  . We say them

when someone gives us a drink, h   3  us to pick up things, or lends us a book.

     Another i   4  word is "please". Many people forget to use it. It is not polite to ask someone to do

something without s   5   "please". We have to use it w   6  we ask for something, too. It may be a book

or a pencil, more rice or help.

     We have to l    7  to say "sorry", too. If we hurt (伤害) someone, we'll have to go up to say "we're

s  8   ". When we forget something, we will a  9  say "sorry".

     These three words are easy b  10  important. Our children must learn to use them. They are pleasing(令人高兴的) words to use in any language (语言).

1._____ 2._____ 3._____ 4._____ 5._____

6._____ 7._____ 8._____ 9._____ 10._____

尿液的真酸度是指 （）

A.尿液中所有能离解的氢离子浓度

B.尿液中所有能离解的氧离子饱和浓度

C.尿液中所有能离解的钠离子浓度

D.尿液中所有能离解的OH离子浓度

E.尿液中所有能离解的钾离子浓度

初凝时间

药物所处溶液的pH值对药物的简单扩散有何影响请举例说明。

某房屋修建在软土地基上，天然地基土承载力特征值为60kPa，采用水泥土搅拌法处理，根据地层分布情况，设计桩长8m，桩径0.5m，正方形布桩，桩距1.2m，桩周土平均侧阻力特征值15kPa，桩端天然地基土承载力特征值q_p=100kPa，桩端天然地基土的承载力折减系数α取0.5，桩间土承载力折减系数β取0.8，水泥土搅拌桩的立方体抗压强度平均值f_cu=2000kPa，其强度折减系数η取0.3，试问按《建筑地基处理技术规范》JGJ79-2002估算的该复合地基承载力特征值f_spk（kPa）与下列何项数值最接近().

A．150

B．200

C．250

D．300