单项选择题
A.850,850B.850,950C.950,850D.900,850
A.925,870B.870,850C.1000,950D.950,1050
A.900℃,900℃B.900℃,850℃C.850℃,850℃D.900℃,1050℃
A.低于7B.低于5C.>=7D.只有等于7
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