由三杆构成的结点，有两杆共线，且无荷载作用，则不共线的第三杆的内力必为零，共线的两杆的内力相等，符号相反。 - 查题网

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成人高等教育 / 建筑力学

正确率：100%

由三杆构成的结点，有两杆共线，且无荷载作用，则不共线的第三杆的内力必为零，共线的两杆的内力相等，符号相反。

A、正确
B、错误

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建筑力学

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It is obvious that television has both advantages and disadvantages. In the first place, television is not only a convenient source of pleasure, but also a quite cheap one. For a family of four, for example, it is more convenient as well as cheaper to sit comfortably at home, with so many interesting programs available, than to go out for something else. There is no transport to arrange. They do not have to pay for expensive seats at the theatre, or the like, only to discover, perhaps, that the show is disappointing. All they have to do is to turn a knob, and they can see plays and shows of every kind, not to mention the latest current events. Some people, however, maintain that this is just where the danger lies. Those who watch television need do noting. They are completely passive and have everything presented to them without any effort on their part. 大学英语

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