The rated output current is 120 amps with forced air cooling, and 60 amps for 30 minutes with radiation and convection cooling. The above sentence means "在强迫冷却的情况下，额定输出电流是60安培（A）；在辐射和对流冷却的情况下，额定输出电流是120安培（A），持续30分钟"。
A.1
正确答案是B
The rated output current is 120 amps with forced air cooling, and 60 amps for 30 minutes with radiation and convection cooling. The above sentence means "在强迫冷却的情况下，额定输出电流是60安培（A）；在辐射和对流冷却的情况下，额定输出电流是120安培（A），持续30分钟"。
A.1
正确答案是B