题目：
饼形大锻件探伤，如果用底波调节探伤起始灵敏度，对工件底面有何要求？
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, C, D
饼形大锻件探伤，如果用底波调节探伤起始灵敏度，对工件底面有何要求？
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