在COND AIR(调节空气)位,两个关断活门打开,加热器接通工作。该加热器在ON(接通)和OFF(关断)位之间循环,以使货舱温度保持在( ).In the COND AIR position, both shutoff valves are open and the heater is enabled. The heater will cycle ON and OFF as necessar... A. 16℃-30℃ B. 16℃...