【简答题】图1是一个机器零件的立体示意图,为了求出这个零件大小两个同心圆柱的半径,陈华用曲尺在大圆柱的背面上画了两条互相垂直的弦AB、BC,如图2所示,其中AB⊥BC,AB与小圆相切于点D,已知量得AB=12cm,BC=5cm,分别求这两个圆的半径.
【多选题】信息安全就是要防止非法攻击和病毒的传播,保障电子信息的有效性,从具体的意义上来理解,需要保证哪几个方面的内容?( )
【简答题】根据汉语意思完成句子。 1. Gu Changwei is one of the top_________(摄影师)in China. 2. In your spare time, what do you like for__________(娱乐)besides watching TV? 3. Look at these________(照片)!I took them in Paris. 4. ...
【判断题】人物画《步辇图》是唐朝画家顾恺之的名作之一。 The figure painting 《步辇图》is one of the masterpieces of the Tang Dynasty painter Gu Kaizhi.
【简答题】传统的饮食器具以__________________为主。
【单选题】Which one is one of the best paintings by Gu Kaizhi ?
B.
Noble Ladies in Tang Dynasty
C.
Nymph of the Luo River
D.
Emperor Taizong Receiving the Tibetan Envoy
【简答题】如图:已知AB是⊙O的直径,P为AB的延长线上一点.且BP= AB,C、D是半圆AB的两个三等分点,连接PD. (1)PD与⊙O有怎样的位置关系?并证明你的结论; (2)连接PC,若AB=10cm,求由PC,弧CD、PD所围成的图形的面积(结果保留π).
【单选题】通常说将自阀手柄置于4位,其实就是将自阀手柄置于()。
【单选题】One of the well-accepted version of Wu Gu or Five Grains is:
A.
sweet potatoes, corns, yams, potatoes and pumpkins;
B.
millet, broomcorn millet, rice, wheat and soybean;
C.
corn, millet, broomcorn millet, rice and wheat;
D.
hemp, rice, millet, broomcorn millet and wheat.