题目：
螺钉头上的数字代表螺钉的（）。
A、规格
B、性能等级
C、尺寸
D、力矩
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B
螺钉头上的数字代表螺钉的（）。A、规格 B、性能等级 C、尺寸 D、力矩
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