【简答题】https://www.geogebra.org/m/pwzvzxag 点击上面的链接,进入后,注意到那个矩形中长度标为1的直角三角形斜边了么? 它周围有四个大小不一的直角三角形。 请观察哪个角是 ,哪个角是 ,将它们组合的三角函数值(右边堆放着,每个都可以移动),将它们放到长度等于它们的边上。 譬如, 角的对边长度就是sin ,邻边长度就是cos 。 所有边的长度都能够以那些堆放好的三角函数值之...
【单选题】在SF 6 分子中,硫的成键轨道是( )。
【简答题】You cannot be ________ careful when you drive a car. A) very B) so C) too D) enough
【简答题】The Japanese have always loved fresh fish. But the waters close to Japan have not held many fish for decades. So fishing boats went farther than ever.but If the return trip took more than a few days, ...
【单选题】清末著名诗人丘逢甲在《春愁》中写道:“春愁难遣强看山,往事惊心泪欲潸。四百万人同一哭,去年今日割台湾。”诗中“往事”是指什么战争的失败( )
【单选题】This sort of rude behavior in public hardly __________a person in your position.
【简答题】煤泥小浮沉为何采用四氯化碳、苯、三溴甲烷等有机溶液配制?