单项选择题
A.10KN B.5KN C.8KN D.1.9KN
A.4.5% B.4.5‰ C.0.45% D.0.45‰
A.＞0.25% B.＞0.35% C.＞0.45% D.＞0.6%
A.≤0.25% B.≤0.15% C.0.25%—0.6% D.＞0.6%
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