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【简答题】
Translate the following sentences into Chinese. 1. Within limits, lift can be increased by increasing the angle of attack, the wing area, the free-stream velocity, or the density of the air, or by changing the shape of the airfoil. 2. Pilots must control the total weight that an aircraft is permitted to carry ( passengers, fuel, and freight) both in amount and in location. The distribution of weight (i.e. , the control of the center of gravity of the aircraft) is as important aerodynamically as the amount of weight being carried. 3. Thrust is obtained by accelerating a mass of ambient air to a velocity greater than the speed of the aircraft. 4. In reciprocating or turboprop-powered aircraft, thrust derives from the propulsive force caused by the rotation of the propeller, with residual thrust provided by the exhaust. 5. In a jet engine, thrust derives from the propulsive force of the rotating blades of a turbine compressing air, which then expanded by the combustion of introduced fuel and exhausted from the engine. 6. The critical Mach number for an aircraft has been defined as that at which on some point of the aircraft the airflow has reached the speed of sound.
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参考答案:
举一反三
【简答题】取下的义齿应浸没于贴有标签的 [填空(1)] 杯中,勿将义齿浸于 [填空(2)] 或 [填空(3)] 中,以免变色、变形和老化。A. B. C.
【简答题】非语言符号的特点是什么?
【多选题】非语言符号的特点包括( )
A.
线性
B.
即时性
C.
协同性
D.
相似性
【简答题】非语言符号的特性
【单选题】( )一直是消费品的主要促销工具。
A.
广告
B.
销售促进
C.
人员推销
D.
宣传
【简答题】简述非语言符号的特性。
【多选题】取下的义齿应浸没于贴有标签的 [填空(1)] 杯中,勿将义齿浸于 [填空(2)] 或 [填空(3)] 中,以免变色、变形和老化。
A.
冷水
B.
热水
C.
乙醇
【简答题】非语言符号的特点有:超前性、非程式性、 _________、_________、_________、地域与文化差异性。
【简答题】非语言符号的特点和作用各有哪些?
【单选题】非语言符号的特点下面哪个是错误的?()
A.
相似性
B.
协同性
C.
即时性
D.
具体性
参考解析:
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