Because of the backward navigation technology and bad weather, Buddhist monk Jianzhen successfully arrived in Japan after six East-crossings for more than 10 years. 由于航海技术落后和气象恶劣等原因，鉴真历经10余年6次东渡，方才成功抵达日本。
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所谓“地理纬度”是指________。 The "geographical latitude" refers to______
A. 地球上某点的法线与赤道面的交角 The angle between the normal of a point on the earth with the equatorial plane
B. 地球上某点和地心连线与赤道面的交角 the angle between a point on the earth with the center of the earth at the equatorial plane
C. 地球椭圆子午线上某点和地心连线与赤道面的交角 The intersection of a point on the earth's elliptic meridian and the geocentric line with the equatorial plane
D. 某点在地球椭圆子午线上的法线与赤道面的交角 The intersection of the normal line of a point on the earth's elliptic meridian with the equatorial plane
地理纬度是某地子午线的__________与赤道面的交角。Geographical latitude is the crossing angle between ______line of the meridian of a point on earth and Equatorial plane
A. 半径 radius
B. 切线 tangent
C. 法线 normal
D. 铅垂线 plumb
干粉灭火系统是以________为动力以达到扑救火灾的目的.The dry powder fire extinguishing system is powered by ___ to achieve the purpose of fighting fire.
A. 海水压力 Seawater pressure
B. 泡沫压力 Foam pressure
C. 氮气 Nitrogen
D. 蒸汽 Steam
必须完全确认处所没有人员存在时施放的灭火系统为________？Which fire extinguishing system must be completely confirmed that no person exists in the premises.
A. 泡沫灭火系统 Foam fire extinguishing system
B. 水灭火系统 Water fire extinguishing system
C. 自动喷水系统 Automatic water spray system
D. 固定式二氧化碳灭火系统 carbon dioxide fire extinguishing system
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