单项选择题
A.1倍,1.5MPa B.1.5倍,1.5MPa C.1.5倍,0.6MPa D.1倍,0.6MPa
A.1% B.1‰ C.5% D.5‰
A.彻底 B.100﹪ C.80﹪ D.50﹪