下面关于冰雹的论述哪一个正确＿＿
A. 堡状云通常会产生冰雹
B. 地面下雨表明空中冰雹已消失
C. 雹块能被抛出雷暴云几千米远
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在卫星云图上，表现为白色、光滑、边缘整齐的云是
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当ADG放出时，哪个ACMP泵由ADG直接供电？Which ACMP is directly powered by the ADG when ADG deployed?
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尝试起动发动机前确认ITT温度必须地面低于（ ）度，空中低于（ ）度。Prior to engine start attempt , confirm ITT temperature must below （ ）° on the ground, below （ ）° in the air.
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主起落架保持在收上位依靠：The main landing gear are held up by:
A. 液压系统3压力 Hydraulic system 3 pressure.
B. 由系统2提供的液压上位锁 Hydraulic uplocks powered by system 2.
C. 机械上位锁 Mechanical uplocks
D. 气压 Air pressure.
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暖锋过境时机场的
A. QFE 减小QNH 增大
B. QFE 和QNH 都减小
C. QFE 和QNH 都增大
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判断正误True or false: PFD上出现的红色IAS或 ALT或V/S故障旗，代表大气数据计算机失效。Red flag IAS or ALT or V/S displayed on the PFD, indicates ADC is failed
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机翼和整流罩防冰的引气来源是什么？What is the source(s) of bleed air for wing and cowl anti-icing ?
A. APU和发动机APU and engines
B. 发动机Engines
C. APU
D. APU和外部地面气源APU and external ground air
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“所需目视参考”是飞机安全落地的必要条件，规章中规定 除II类、III类进近之外，驾驶员应至少能清楚的看到和辨认计划着陆 跑道的下列目视参考之一 Required visual reference" is a necessary condition for the safe landing of aircraft. The regulations stipulate that except for CATII and CATIII approaches, the pilot shall be able to clearly see and identify at least one of the following visual references of the planned landing runway
A. 进近灯光系统，如果驾驶员仅使用进近灯光作为参考，应当能 同时清楚地看到和辨认“红色终端横排灯”或者“红色侧排灯” for the approach light system, if the pilot only uses the approach light as a reference, he/she should be able to clearly see and identify the "red end cross row lights (only exists in some foreign airports)" or "red side row lights (side short row lights)", otherwise he/she shall not descend below 30m (100 feet) above the elevation of the TDZ;
B. 跑道入口;
跑道入口标志;
跑道入口灯;
跑道端识别灯;
目视进近下滑道指示灯Runway threshold;
Runway threshold marks;Runway threshold lights;Runway end identification lights; VASI lights;
C. 接地区或者接地区标志;
接地区灯;
跑道或者跑道标志;
跑道灯TDZ or TDZ marks;(8) TDZ lights;(9) Runway or runway marks;runway lights
D. 以上全部 all of the above
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从下列引气源中选出两个空中操作环控系统的引气源From the list of pneumatic air sources, identify the two used to operate the environmental control system in flight.
A. 14级引气 14th stage bleed air
B. 冲压空气 ram air
C. APU在41,000英尺及以下高度 APU at 41,000 ft and below
D. APU在25,000英尺及以下高度 APU at 25,000 ft and below
E. 两台发动机 both engines
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