For some stainless steels, when heated to a certain temperature range (（）) for a sufficiently long time, these alloys become sensitized to intergranular attack

For some stainless steels, when heated to a certain temperature range (（）) for a sufficiently long time, these alloys become sensitized to intergranular attack
A.300℃-600℃
B.400℃-700℃
C.500℃-800℃　
D.700℃-1000℃
正确答案：500℃-800℃