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地上敷设的优点包括()。
A、不受地下水位、土质和其它管线的影响
B、构造简单
C、维修方便
D、一般较为经济
【参考答案】
A,B,C,D
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My First Marathon( 马拉松)
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Find Your Adventure at the Space and Aviation ( 航空)Center If you&39;re looking for a unique adventure, the Space and Aviation Center(SAC)is the place to be. The Center offers programs designed to challenge and inspire with hands-on tasks and lots of fun.More than 750, 000 have graduated from SAC, with many seeking employment in engineering, aviation,education, medicine and a wide variety of other professions. They come to camp, wanting to know what it is like to be an astronaut or a pilot, and they leave with real-world applications for what they&39;re studying in the classroom.For the trainees ,the programs also offer a great way to earn merit badges(荣誉徽章). At Space Camp, trainees can earn their Space Exploration badge as they build andfire model rockets, learn about space tasks and try simulated ( 模拟) flying to space withthe crew from all over the world. The Aviation Challenge program gives trainees the chance to earn their Aviation badge. They learn the principles of flight and test theiroperating skills in the cockpit( 驾驶舱)of a variety of flight simulators. Trainees alsoget a good start on their Wilderness Survival badge as they learn about water-and land-survival through designed tasks and their search and rescue of “downed pilot.With all the programs, teamwork is key as trainees learn the importance ofleadership and being part of a bigger task.
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