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近代中国率先主动了解西方，提倡“师夷”之说的是魏源。( )
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甲公司因转产致使一台价值1000万元的精密机床闲置。该公司董事长王某代表本公司与乙公司签订了一份机床转让合同。合同规定，精密机床作价950万元，甲公司于10月31日前交货，乙公司在交货后10天内付清款项。在交货日前，甲公司发现乙公司经营状况恶化，通知乙公司提供担保，乙公司予以拒绝。又过了1个月，甲公司发现乙公司的经营状况进一步恶化，于是提出解除合同。乙公司遂向法院起诉。问： 甲公司能否解除合同为什么
A．heatB．meatC．cheatD．heavy
A建筑公司中标承接了一项大型综合楼工程的施工任务，该工程地处繁华市区，东临城市主干道，A建筑公司为总承包单位，及时组建了该工程的项目经理部，明确了施工安全管理目标，公司和项目部都设立了安全管理机构，项目部也编制了该工程的施工安全管理计划和施工安全技术措施。根据材料，回答以下问题： 该工程在施工安全策划中，应在确保安全目标的前提下，在经济投入、人力投入和物质投入上坚持（）原则。
Online distance learning is an instructional system which connects learners with educational resources. Students work on their own at home, at work, or at school and communicate with faculty and other students by means of e-mail, electronic meetings, videoconferencing, chat rooms, instant messaging and other forms of computer-based communication. There are both advantages and disadvantages to online distance learning.There are many benefits to using online distance learning environments. Online education is available all the time, anywhere and to all people. However, there are weaknesses for some learners. The online learner only has the written text and no other face-to-face hints. This may confuse the learner and cause misunderstanding. While distance learning allows for an openness, it is also difficult because it is done by e-mail messages and writing, and therefore may take more time than face-to-face learning. Sometimes the messages can be overwhelming for many online students.Universities, colleges and schools use online distance learning environments. These are important for students who may be unable to attend classes for various reasons like illnesses or busy everyday schedules. Some learners just want to further their studies at home. They enjoy the convenience of home learning as they take regular programs or enrichment classes.Online courses keep learners very occupied at all hours of the day. There are a great many messages and other online resources to read and respond to. Most learners have regular jobs or attend regular school classes on ground as well. However, the benefits are clear. Online distance learning is becoming very popular. Some online classes have become a profitable business as they replace regular traditional means of learning. Which of the following is TRUE of the passage about online distance learning（）
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