拉伸强度在220000Psi以下的合金钢用什么方法清除腐蚀（）？（1）钢丝刷（2）喷

将下列物质进行分类：

①H与H ；

②O₂与O₃；

③乙醇（C₂H₅OH）与甲醚（CH₃—O—CH₃） ；

④正丁烷（CH₃CH₂ CH₂ CH₃）与异丁烷（） ， 

⑤甲烷（CH₄）与丙烷（C₃H₈）。

（1）互为同位素的是         （填序号、下同）；

（2）互为同系物的是                  ；

（3）互为同分异构体的是                 。

ZJ-45型钻机上配备的空压机有（）种驱动形式。

A、1

B、2

C、3

D、4

Currently 94% of Web users use either Internet Explorer or Firefox, but recently some new (71) have been developed that are beginning to attract attention. The browser Opera is becoming very (72) because of its speed, it is currently the world’s fastest browser, and because it is much smaller (73) existing browsers (it can almost fit on a single diskette). It can also (74) the last Web page you visited, so the next time you surf, you can start where you left off. And like the big two, you can get it for free; the catch is that you have to watch blinking ads in one comer, or pay ＄40 for the ad-free (75) of Opera.

A．version

B．revision

C．software

D．book

男性，60岁，健康体检中发现：乙型肝炎病毒标记阳性，ALT：120U/L，AFP：150μg/L。B超和CT检查均未发现肝脏占位性病变

应采取的措施是（）

A.选择性肝动脉造影

B.肝穿刺活检

C.定期随访AFP和ALT

D.GGT2检查

E.手术治疗

雪白在未烧前是粉白色，烧后呈乳白。