从一副扑克牌中任取一张，是A的概率是______．

A department store made an announcement in the local newspaper to launch a bonus sale promotion in July 2008. Under this promotion plan any consumer who bought commodities for RMB 200 yuan would be granted one bonus coupon with a particular number for a lucky-draw. The lucky-draw would be made publicly on 31 July 2008. During July Mr Zhou received five coupons for buying commodities totalling more than RMB 1,000 yuan in the department store.On 31 July 2008 the department store made the lucky-draw in public and announced all the numbers of coupons in winning the bonus.On 2 August 2008 the department store put a written notice on the notice board in the front of its premises, stating that the winners should come to cash the bonus before 10 August 2008, otherwise they should be regarded as automatically giving up the bonus.On 12 August 2008 Mr Zhou got to know the lucky number on one of his coupons was the same as the lucky number for the first class bonus of RMB 5,000 yuan. He went to the department store to cash the bonus but was refused by the department store on the grounds that he was too late to take the bonus.Required:Answer the following questions in accordance with the relevant provisions of the Contract Law of China and give your reasons for your answers:

(a) State the legal nature of the announcement for the bonus sale promotion by the department store. (2 marks)

形状复杂的冲裁件，适于用凸、凹模分开加工。

患儿，11个月。出生后反复呼吸道感染，2天前发热，咳嗽，气促烦躁不安。体检：呼吸58次/分，口唇青紫，两肺细湿啰音。于胸骨左缘第3、4肋间听到收缩期杂音Ⅲ～Ⅳ级，并触到收缩期震颤。肺动脉第二心音亢进，肝右肋下4cm。双足背轻度水肿。考虑诊断为（）

A.室间隔缺损

B.室间隔缺损合并肺炎

C.室间隔缺损合并心力衰竭

D.室间隔缺损合并肺炎和心力衰竭

E.室间隔缺损合并亚急性细菌性心内膜炎

喷煤的热滞后时间