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数据库技术的研究领域，概括地讲，可以包括数据库管理系统软件的研制、数据库理论和______。

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HMS Belfast is a cruiser. She was launched in March 1938 and served throughout the Second World War, playing a leading part in the destruction of the German battle cruiser Scharnhorst at the Battle of North Cape and in the Normandy Landings. After the war, she supported United Nations forces in Korea and remained in service with the Royal Navy until 1965.In 1971 she was saved for the nation as a unique and historic reminder of Britain’s naval heritage in the first half of the 20th century.A free guide leaflet is available to help you find your way around this huge and complex war ship and your tour will take you from the ship’s Quarterdeck up to the top of her Bridge and all the way down through seven decks to her massive Boiler and Engine Rooms, well below the ship’s waterline.HMS BelfastHMS Belfast was launched in (46) 1938.The cruiser played a leading part in (47) landing.By 1965 the cruiser had been in service for (48) years.The tour will begin from the ship’s (49) .There are (50) decks in the ship. 4（）

死锁的4个必要条件是 [2] 、 [3] 、不剥夺条件和循环等待。

国债登记结算公司、证券登记结算公司上海、深圳分公司于规定的债权登记日，对当期国债进行总债权登记和分账户债权托管。（）

A. 对
B. 错

某建筑公司为一般纳税人，具有建筑资质和资格，2011年9月发生以下业务： (1)为本市某歌厅提供装饰装修劳务，取得劳务收入120万元。 (2)为本市工业企业建造职工休闲娱乐室，按合同约定，建筑材料120万元由建筑公司外购，提供建筑劳务30万元。 (3)为本市医院建造职工家属楼，工程施工中耗用自产的建筑材料含税价1800万元，另收取建筑劳务工程款800万元。合同中已经分别注明材料和劳务工程款。 (4)为本市政府装修政府大楼，工程营业额为320万元，已经开具营业税发票320万元。要求：根据以上资料，按照下列序号计算回答问题，每问需计算合计数。建筑公司为工业企业建造职工休闲娱乐室应纳营业税。