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单项选择题

Plato is known for his famous allegory of the cave, which tells us that ________.
A、we should get out of the cave and gain enlightenment
B、people there are chained in legs and necks
C、we see shadows and take them to be real figures
D、we all live in the cave all our lives

判断题

碳含量对奥氏体不锈钢的晶间腐蚀敏化倾向有影响，碳含量越高、其敏化倾向越严重，TTT曲线左移。