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单选题
2810. 温度下降率从海平面到海拔高度-56℃是每英尺-000198℃,并在该高度以上降至零。
A
The temperature gradient from sea level to the altitude at which the temperature is -56.5℃ (-69.7℉) is -0.00198℃ (- 0.003564℉) per foot and zero above that altitude.
B
The temperature varies from sea level to the altitude at which the temperature is -56.5℃ (-69.7℉) is -0.00198°C (- 0.003564℉) per foot and zero above that altitude.
C
The temperature from sea level to the altitude at which the temperature is -56.5℃ (-69.7℉) drop to -0.00198℃ (- 0.003564℉) per foot and to zero above that altitude.
答案解析
正确答案：C
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