单项选择题
A．≤0.15MPa B．≤0.2MPa C．≤0.22MPa D．≤0.25MPa
A．0.15～0.25MPa B．0.2～0.27MPa C．0.22～0.30MPa D．0.25～0.32MPa
A．0.25～0.35MPa B．0.27～0.37MPa C．0.3～0.4MPa D．0.32～0.42MPa
A．＞0.35MPa B．＞0.37MPa C．＞0.4MPa D．＞0.42MPa
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