系统仿真根据系统的特性，可以分为连续系统仿真和离散事件系统仿真及（）。 A.采样系统

某钢铁厂今年1月份生产某种钢材5000吨，3月份生产这种钢材7200吨，设平均每月增长的百分率为x，则根据题意可列方程为（    ）。

应用胆碱酯酶复活剂应注意

A．切勿两种或三种复活剂同时使用，以免毒性增加

B．复活剂对毒蕈碱样作用较强

C．复活剂不需稀释，直接注射

D．中毒已超过3日使用复活剂仍然有效

E．与阿托品联合应用无协同作用

三甘醇的比热容随温度升高而增大。

阅读理解

     Competition. It's a simple word, yet a very complex word that covers many angles when it comes to

how gasoline prices are determined. It seems so easy to explain, but don't let that trick you-it's incredibly

difficult to explain and adequately understand.

     Say you're on a Sunday afternoon drive, and notice a gas station near you charging $3.50. Down the

road a few miles, that price could easily be 10 or more cents higher or lower. The question is "how" or

"why" is that? Think of it this way. Are you more likely to get a better deal on a car if there are two similar car dealers next to each other? Perhaps, because the dealers are too close. Say there is a third similar car dealer miles away. Is he going to be at the same level of competition and sell his cars for the same price as the two dealers next to each other? Likely not. He may charge more or less. Maybe people don't know

there are two other dealers down the road. Maybe the dealer is almost outside of the city and the land

value isn't as high, so his taxes aren't as high.

     These situations do take place at gas stations. And more factors can impact what a station will charge. Timing can greatly impact what price a station charges as well! Many motorists fail to realize that the price a station pays for gasoline changes daily. If one station gets lucky and buys gas on Monday and the cost

goes up Tuesday, the station that bought on Monday doesn't necessarily have to raise prices like the

station that bought on Tuesday. Maybe the station that got caught buying for a higher price on Tuesday

will pass that higher cost on by raising its gas price.

      Perhaps the difference is what brand the station is-branded stations usually pay a slightly higher cost

for their gasoline. In return for paying a higher cost, those stations are guaranteed first supply in case of

emergency situations. Independent stations don't pay as much, but aren't guaranteed supply.

     While competition sounds easy to understand, there are always a large number of factors that could

influence what one station charges. Keep in mind how many variables (变数) there are next time you fill

up.

1. What could be the best title for the passage?

A. How Competition Impacts Gas Prices 

B. Gas Prices Go Up or Down

C. Competition---a Very Complex Word 

D. We Can't Stress Enough the Need for Competition  

2. The example of car dealers is used to show ________.  

A. car prices are determined by car dealers

B. location is an important factor in pricing

C. the quality of service matters most

D. dealing strategy should be flexible

3. The gas prices of a station always change partly because _______. 

A. a gas station always wants to charge more

B. the gasoline is in great demand

C. the cost of the gas the station buys varies daily

D. gas is in greater need on Monday

4. According to the passage, branded stations _______.

A. spend less money on their gasoline        

B. have more staff than independent stations

C. charge less for high quality oil            

D. offer a steady oil supply

根据《深圳经济特区道路交通安全违法行为处罚条例》规定，对情节轻微、未影响道路通行的违法行为，经交通警察指出后，行为人能及时纠正给予口头警告后放行。