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单选题
从海平面到温度为-56.5摄氏度的海拔高度之间的温度变化率为每英尺-0.00198摄氏度。在该高度之上温度变化率为零。
A
The temperature decreases - 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and zero above that altitude.
B
The temperature gradient from sea level to the altitude at which the temperature is -56.5°C is - 0.00198°C per foot and zero above that altitude.
C
The temperature drops 0.00198°C per foot from sea level to the altitude at which the temperature is -56.5°C and to zero above that altitude.
答案解析
正确答案：B
相关知识点：
海平面到-56.5度温度变化记
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