在硫磺制酸装置火管锅炉降温降压后，为什么需待锅炉炉水温度低于一定程度后才能排放炉水？
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普通23t轴重货车重车位铸铁闸瓦换算闸瓦压力为330kpa，空车位铸铁闸瓦换算闸瓦压力为（）kpa。
A. 130
B. 150
C. 300
D. 330
Each person at the reunion was required to talk to other relatives to find out if they would buy one of the histories（）it were printed.
A. whether
B. if
C. when
D. after
计量经济学方法不是计划工作方法。
A. 正确
B. 错误
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