搞好锅炉炉体刚性梁的（）、（），确保炉体有足够的抗爆强度。

下列课文内容与作家、作品、体裁对应不完全正确的一项是[ ]

A．黑布小帽、黑布大马褂、深青布棉袍的父亲——朱自清——《背影》——散文

B．西北望，射天狼——苏轼——《水调歌头·明月几时有》——词

C．菲利普夫妇——莫泊桑——《我的叔叔于勒》——小说

D．鲁提辖拳打镇关西——《水浒传》——施耐庵——小说

Transportation Decision Transportation decision consists of the following parts: 1.Selection of the mode is determined by the consideration of distance,cargo weights,linkage,timing and other requirements.Generally speaking,rail has high fixed cost and the relatively low variable cost.It can move heavy,large quantity of cargo in the long distance.But,rail is disadvantaged because of the longer transit time and less frequent service than motor. Motor carriers such as truck companies offer door-to-door service,that is,the cargo can be shipped from the shipper＇swarehouse to the consignee＇s.Trucking fixed cost is the lowest of any carrier,because the equipment is fairly cheap and the motor carriers do not have to invest in the roads on which they run their operations.However,their variable costs are very high.Its expenses include two major components:firstly,the pick-up and delivery costs;secondly,there are gas or fuel costs,labor expenses and toll roads fees to be paid to highway and toll road operators Therefore,motor transport is good for cargo with small quantity to be shipped within short distances. Water is the predominant choice of transportation as it has the capacity to take greatest quantity,travel longest distance with lowest cost.Transport by sea accounts for 80% of in-ternational trade.The major expenses for water are expenses associated with investment and maintenance of the ships and terminals.For example,a 100000-ton container ship costs US$ 200 million.Terminal associated costs include harbor fees and the cost for loading and unloading the goods. Transport by air has the highest cost but it is fast with the lowest ratio of loss and dam-age.If you need to deliver an urgent order,there is little choice but by air. 2.Transport service provider is selected for its experiences,equipment,services and prices.Competitive in the transport industry usually drives the prices down and motivates for better services.A company also chooses its transport service provider because of its long-standing business relationship with certain shipping companies. 3.The alternative routing and scheduling is specific for motor only because railway and water have strict route and timetable.Motor has special advantage in terms of flexibility.It has the ability to load goods at greater frequency,travel through different routes and making deliveries to different loca-tions.Questions:

For heavy and long distance cargo with low cost，which of the following is the pre-ferred mode for transportation？（）

A.Trucks.

B.Water.

C.Aircraft.

D.Broken down in small bulks and deliver by air.

供给弹性系数是指当______变动百分之一时，供给量变动的百分比( )

A．需求量

B．价格

C．价值

D．收入

情感障碍通常表现为3种形式，即情感性质的改变、情感波动性的改变以及情感协调性的改变，下列哪个症状属于情感性质的改变（）

A.焦虑

B.情感不稳

C.易激惹性

D.情感淡漠

E.情感不协调

华侨、香港、澳门、台湾居民申请办理收养登记，收养人应当向收养登记机关提交哪些文件材料？