單項(xiàng)選擇題
A.500 B.800 C.1000 D.1200
A.1 B.1.5 C.2 D.3
A.5 B.10 C.15 D.20
A.1比1至1比1.5 B.1比1.25至1比1.5 C.1比5至1比1.75 D.1比1至1比1.75
A.1680 B.1760 C.1840 D.1920
A.8‰ B.10‰ C.11‰ D.12‰
A.1600 B.1680 C.1760 D.1840
A.1‰ B.2‰ C.3‰ D.4‰
A.0.4 B.0.6 C.0.8 D.1
A.30 B.40 C.50 D.60
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