线桥作业前，施工作业负责人和机具使用人员在机具使用前应作什么？

斯托克斯定律说明了固体粒子的沉降速度与流体的粘度成正比。

They say that soon, we will be able to receive more than 500 television networks on cable or by satellite. Some people think that it’s useless to have that many channels. Their usual criticism(批评) goes something like this: "I already get more channels on my TV than I have time to watch. No one needs to see that much TV. There’s not enough time in the day to watch all that!"They also say that most of what’s on television now isn’t worth watching in the first place.

I think they’re missing the point. If the local library wanted to add another 5,000 books, would we say, "That’s silly, we’ll never have time to read all those books"? The point is that we would have more choices.

I don’t believe that most people should watch more television. And if we had 500 or even 1,000 channels to choose from, we wouldn’t have to spend more time watching TV. We would, however, have more programs to choose from. That means that the quality of our viewing time would be improved.

I think the more channels we have, the better. Give me more choices! If they’re not worth my time, I’ll just hit the "off" button.

小题1:The purpose of writing this passage is to ______.

A．make a suggestion

B．express an opinion

C．give important information

D．complain about cable television小题2:From the passage we know that the author wants to ______.

A．read more books

B．rent more TV sets

C．have more choices

D．watch more sports小题3:The number of television channels is ______.

A．increasing fast

B．decreasing fast

C．never going to be more than 1,000

D．the same as that of books in the library小题4:To make his point, the author compares the development of TV networks to that of ______.

A．schoolyards

B．computers

C．libraries

D．satellites小题5:What does the phrase "hit the 'off’ button" refer to?

A．Go to the library.

B．Switch over the TV channels.

C．Turn off the TV.

D．Have more TV networks.

如果在中控旁通仪表风压力低低，仪表风压力持续下降不会出现的后果是（）

A、SDV阀关闭

B、BDV阀打开

C、中控报警

D、所有泵关停

《米龙老爹》一文的叙述特点是

A．第一人称自叙
B．第三人称
C．第二人称
D．第一、第三人称互换

杨某某、罗某与黄某本是好朋友。后来杨某某发现罗某与黄某有盗窃行为，遂向公安机关报案，结果黄某与罗某都被判处有期徒刑2年。两年后，黄、罗同时出狱。他们对杨某某的行为十分气愤，相约第二天晚上八点去找杨某某算账。第二天晚上黄某在家等罗某，等了很长时间也没见罗某来找，便自己一个人去杨家找杨"算账"，黄某到杨家，发现杨家的房门虚掩着，便轻轻推门进去，一看杨某某倒在血泊之中，杨身边的地上有用血写的"恶有恶报"四个大字，黄某一看便明白罗某已来将杨"搁倒"了。心想自己也不能落后，于是从杨的厨房里找出一把菜刀，将杨的尸体切成八大块。后来案件被侦破，杨某某确系罗某所杀。　　 关于黄某，下列说法正确的是______。

A．黄某的行为是故意杀人罪的预备行为

B．黄某的行为不构成犯罪

C．黄某犯罪行为的状态是既遂

D．黄某犯罪行为的状态是未遂