钢结构的表面长期受辐射热达多少度时,应采取有效的隔热措施()?
A.100℃
B.150℃以上
C.200℃以上
D.600℃以上
参考答案:B
Currently 94%of Web users use either Internet Explorer or Firefox.but recently somenew (71) have been developed that are beginning to attract attention.The browser Opera isbecoming very (72) because of its speed,it is currently the world’S fastest browsec andbecause it is much smaller (73) existing browsers(it can almost fit on a single diskette).It canalso (74) the last web page you visited,so the next time you surf,you can start where you leftoff.And like the big two,you can get it for free;the catch is that you have to watch blinkingads in one comeL orpay$40 forthe ad—free (75) ofOpera.
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下列关于吸入给药的叙述中错误的是()
A.巨大的肺泡表面积、丰富的毛细血管和极小的转运距离,决定了肺部给药的迅速吸收
B.吸收后的药物经受肝的首过效应影响
C.上呼吸道气管壁上的纤毛运动可使停留在该部位的异物在几小时内被排出
D.呼吸道上皮细胞为类脂膜,药物的脂水分配系数影响药物的吸收
E.吸湿性强的药物,在呼吸道运行时由于环境的湿度,使它易在上呼吸道截留