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【单选题】
Where Did All the Ships Go? The Bermuda Triangle is one(1)the greatest mysteries of the sea. In this triangular area between Florida, Puerto Rico and Bermuda in Atlantic, ships and airplanes(2)to disappear more often than in(3)parts of the ocean. And they do so(4)leaving any sign of all accident or any dead bodies. It is(5)that Christopher Columbus was the first person to record strange happenings in the area. His compass stopped working, a flame came down from the sky, and a wave 100 to 200 feet high carried his ship about a mile away. The most famous disappearance in the Bermuda Triangle was the US Naval Air Flight 19.(6)December 5, 1945, five bomber planes carrying 14 men.(7)on a training mission from the Florida coast. Later that day, all communications with Flight 19 were lost. They just disappeared without a trace. The next morning, 242 planes and 19 ships took part in the largest air-sea search in history. But they found nothing. Some people blame the disappearances(8)supernatural forces. It is suggested the(9)ships and planes were either transported to other times and places, kidnapped by aliens(10)attacked by sea creatures. There are(11)natural explanations, though. The US Navy says that the Bermuda triangle is one of two places on earth(12)a magnetic compass points towards tree north(13)magnetic north.(14)planes and ships can lose their way if they don't make adjustments. The area also has changing weather and is know(15)its high waves. Storms can turn up suddenly and destroy a plane or ship. Fast currents could then sweep away any trace of an accident. Bermuda Triangle 百慕大三角区 Pueto Rico 波多利加 compassn. ,指南针 supernatural adj.超自然的 kidnap v.绑架 alien n.外星人 magnetic adj. 有磁性的
A.
from
B.
of
C.
about
D.
on
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【单选题】纯电容电路的功率因数( )。
A.
大于0
B.
小于0
C.
等于0
D.
大于等于0
【单选题】核酸的基本组成单位是
A.
DNA
B.
核苷
C.
核苷酸
D.
磷酸戊糖
E.
多核苷酸
【单选题】制冷设备布置应使管路尽量短,另外还有一定的管径要求。目的是减少()。
A.
压力
B.
重力
C.
动力
D.
阻力
【简答题】纯电容电路的功率因数为()。
【简答题】电气火灾主要包括以下四个方面,分别为_______、_______、过负荷火灾、接触电阻过大火灾。
【单选题】纯电容电路的功率因数( )
A.
大于0
B.
等于0
C.
小于0
D.
无法确定
【单选题】核酸的基本组成单位是(    )。
A.
戊糖和碱基    
B.
戊糖和磷酸
C.
核苷酸        
D.
戊糖、碱基和磷酸
【简答题】电气火灾主要包括以下四个方面,分别为________、________、过负荷火灾、接触电阻过大火灾。
【单选题】纯电容电路的功率因数( )零
A.
大于
B.
小于
C.
等于
D.
等于或大于
【单选题】歌曲轻松活泼,欢快爽朗,表现了劳动人民大清早下地干活怡然自得的愉快心情。
A.
《绣荷包》
B.
《杨柳青》
C.
《花桥到门前》
D.
《凤阳花鼓》
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