单项选择题
A.0-1800℃ B.0-400℃ C.-20-400℃
A.5% B.1% C.10%
A.0.5-1.0 B.1.0-1.5 C.0.1-2.5
A.99%-99.9% B.90%-99% C.99.9%-99.99%
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