题干

一副含30°和45°角的三角板ABC和DEF叠合在一起,边BC与EF重合,BC=EF=12cm(如图1),点G为边BC(EF)的中点,边FD与AB相交于点H,此时线段BH的长是____.现将三角板DEF绕点G按顺时针方向旋转(如图2),在∠CGF从0°到60°的变化过程中,点H相应移动的路径长共为____.(结果保留根号)

上一题 下一题 0.0难度 选择题 更新时间:2017-03-21 12:25:22

答案(点此获取答案解析)

123\u221212,123

同类题3

阅读下面短文,从短文后各题所给的四个选项(A、B、C和D)中,选出可以填入空白处的最佳选项。

    Designer Susan McLeary is taking the jewelry world by storm with her jewelry made from living plants. She uses real succulents(多肉植物)collected from her 1 to create wonderful headpiece, necklaces, rings bracelets, and other pieces of bio-jewelry that literally 2 on you.

    Each piece from McLeary's 3 can be worn for two to four weeks before the plants begin to 4 in their metal base. When this happens, wearers can 5 remove the succulents from their metal base and re-pot them to keep in their homes. The jewelry bases can still be 6 as usual. If the pieces are worn for special 7 like weddings, the potted plants become all the more 8.

    McLeary, who has worked with leading floral designers(花艺设计师)across the US, has spent years 9 her two loves — plants and jewelry — and 10 her own style. Before she was a florist, she made jewelry for friends. 11 one of her friend got married, she was asked to design some wedding flowers 12 some jewelry. As she had her friend's flowers in her hands, she knew she had got her idea. She still loves 13 for weddings, but she has found that she enjoy creating floral wears and floral 14 even more.

    She makes each piece by hand, and 15 she can pay careful attention to composition and color. Each jewelry piece is made with 16 sourced plants from a family owned greenhouse and jewelry bases 17 by other small businesses.

    There is no doubt that the floral jewelry adds more fun and more 18 sights to there occasions. Of course, the wearers can also 19 their time by taking care of the plants on their metal base. McLeary's beautiful designs are 20 on her Easy store, which ranges from $ 20 to $ 300.