四六级考试

【单选题】 All equipment in an aircraft must______.
A．be tested to destruction
B．not be too light in weight
C．work especially well at high temperatures
D．work perfectly within a wide range of temperatures

网考网参考答案：D
网考网解析：
本题询问飞机的仪器设备在温度方面的要求。相关信息在文章第五段，关键语句为 “The flying controls, the electrical equipment, the fire precautions, etc. must not only be light in weight, but must work both at high altitudes where the temperature may be below freezing point and in the hot air of an airfield in the tropics”。 查看试题解析出处>>