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问题 单项选择题

单相半波整流电路中流过二极管的正向电流的平均值与流过负载的电流平均值的关系为()

A.两者相等

B.前者小于后者

C.前者大于后者

D.前者等于后者的1/2

答案

参考答案：A

填空题


Questions 47 to 56 are based on the following passage.
The Olympic games (often referred to simply as The Olympics or The Games) is an international multi-sport event subdivided into summer and winter sporting events. The (47) Olympic Games began in 776 BC in Olympia, Greece, and was celebrated until AD 393. There are many myths and (48) of the origin of the ancient Olympic Games. The most popular one describes that Hercules was the creator of the Olympic Games, and built the Olympic stadium and surrounding buildings to (49) his father Zeus. The date of the Olympic Games’ beginning based on the count years in Olympiads is reconstructed as 776 BC, although scholars’ opinions differ between dates as early as 884 BC and as late as 704 BC. From then on, the games became much more important throughout ancient Greece, (50) their peak in the sixth and seventh century BC.
Interest in (51) the Olympic Games was first shown by the Greek poet and news paper editor Panagiotis Soutsos in his poem "Dialogue of the Dead" in 1833. The international Olympic committee was founded in 1894 with the (52) of a French nobleman, Pierre Fredy, Baron de Coubertin. The first of the IOC’s Olympic Games were the 1896 Summer Olympics, held in Athens, Greece. Participants in the Olympic Games have increased to include (53) from nearly all nations worldwide. With the (54) of satellite ’communications and global telecast of the events, the Olympics are (55) gaining supporters. The most recent Summer Olympic in 2008 in Beijing (56) 302 events in 28 sports.
A) comprised B) memory C) modern D) renew
E) consist F) initiative G) deterioration H) improvement
I) consistently J) original K) reviving L) legends
M) reaching N) athletes O) commemorate
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单项选择题

《中华人民共和国建筑法》规定，施工现场对毗邻的建筑构筑物和特殊作业环境可能造成损害的，建筑施工企业应当采取( )。

A．安全防护措施

B．实行封闭管理

C．安全监督措施

D．加强安全生产管理
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