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某条高速公路全长80km，路段上有6个互通立交，并有1.8km和2.1km的长隧道两座。根据提供的交通量，两个隧道都设计有通风、照明及隧道变电所，并有完整的交通安全设施、监控系统及通信系统。该路设有一处监控分中心，能实现隧道变电所无人值守，能和省监控中心实现联网互传信息，以及为运营管理提供信息。 根据此案例场景，回答下列问题： 波形梁护栏属于( )。
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西南某二级公路，K5+800～K10+700为干燥路段，路面结构从上而下分别为沥青混凝土、水泥稳定碎石、厚填隙碎石。面层沥青混合料采用拌和楼集中拌和，15t以上自卸汽车运输，混凝土摊铺机进行摊铺。 施工过程出现下列事件： 事件一：一辆运输车配备的覆盖棚布在运输运混合料的途中，遭遇大风被吹掉，沥青混合料运至施工现场的温度为108℃。 事件二：部分混合料温度较高，导致碾压发生粘轮现象。 根据此案例场景，回答下列问题： 该路面等级属于( )。
某学生在军训时进行打靶测试，共射击10次。他的第6、7、8、9次射击分别射中9.0环、8.4环、8.1环、9.3环，他的前9次射击的平均环数高于前5次射击所得的平均环数。若要使10次射击的平均环数超过8.8环，则他第10次射击至少应该射中( )环(报靶成绩精确到0.1环)。（）
某条高速公路全长80km，路段上有6个互通立交，并有1.8km和2.1km的长隧道两座。根据提供的交通量，两个隧道都设计有通风、照明及隧道变电所，并有完整的交通安全设施、监控系统及通信系统。该路设有一处监控分中心，能实现隧道变电所无人值守，能和省监控中心实现联网互传信息，以及为运营管理提供信息。 根据此案例场景，回答下列问题： 缆索护栏属于( )。
Read the following text. Choose the best word or phrase for each numbered blank and mark A, B, C or D on ANSWER SHEET 1. With Airbus’s giant A380 airliner about in to take to the skies, you might think planes could not get much bigger — and you would be right. For a given design, it turns (21) , there comes a point where the wings become too heavy to generate (22) lift to carry their own weight. (23) a new way of designing and making materials could (24) that problem. Two engineers (25) University College London have devised an innovative way to customise and control the (26) of a material throughout its three-dimensional structure. In the (27) of a wing, this would make possible a material that is dense, strong and load-bearing at one end, close to the fuselage, (28) the extremities could be made less dense, lighter and more (29) . It is like making bespoke materials, (30) you can customise the physical properties of every cubic millimetre of a structure. The new technique combines existing technologies in a(n) (31) way. It starts by using finite-element-analysis software, of the type commonly used by engineers, (32) a virtual prototype of the object. The software models the stresses and strains that the object will need to (33) throughout its structure. Using this information it is then (34) to calculate the precise forces acting on millions of smaller subsections of the structure. (35) of these subsections is (36) treated as a separate object with its own set of forces acting on it — and each subsection (37) for a different microstructure to absorb those local forces. Designing so many microstructures manually (38) be a huge task, so the researchers apply an optimisation program, called a genetic algorithm, (39) This uses a process of randomization and trial-and-error to search the vast number of possible microstructures to find the most (40) design for each subsection.
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