2017年8月8日21时1 9分49秒，四川省阿坝州九寨沟县(东经103. 82°、北纬33.20°)发生7．O级地震，震源深度约20千米。截至11日8时，四川省地震台网共记录到余震总数2318个。此次地震直接经济损失84. 43亿元。

如图，一幢大楼的顶部竖有一块写有“校训”的宣传牌CD．小明在山坡的底部A处测得宣传牌底部D的仰角为60°，沿山坡向上走到B处测得宣传牌顶部C的仰角为45°．已知山坡AB垂直于视线AD，AB=20米，AE=30米，则这块宣传牌CD的高度为____．（测角器的高度忽略不计，结果精确到0.1米．参考数据：$\sqrt{2}$≈1.414，$\sqrt{3}$≈1.732）

    The following are the best restaurants to dine out with your parents in San Francisco.

    Maybeck's

    Marina

    3213 Scott St.

    Telephone(415) 400-8500

    What do you get when you mix amazing foods with a pleasant atmosphere? The perfect place for family dinner. Maybeck's homemade pastas will transport you to the Italian countryside but the fried chicken brings you right back down to earth. It's a great meal in a peaceful setting that everyone will be sure to remember.

    Liholiho Yacht Club

    Nob Hill

    871 Sutter St.

激素在人的生长发育过程中，起到了重要的调节作用．右图是构成内分泌系统的主要内分泌腺示意图，请据图回答：