In ship construction, frame spacing is().
A. greater at the bow and stern
B. reduced at the bow and stern
C. uniform over the length of the vessel
D. uniform over the length of the vessel, with the exception of the machinery spaces, where it is reduced due to increased stresse
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将开始引燃火焰的最低()称为闪点。
A. 气压
B. 温度
C. 湿度
D. 海拔
下列石化设备中,属于反应设备的是()。
A. 聚合釜
B. 蒸发器
C. 分离器
D. 贮罐
简述我国古代科举考试中的作弊现象和防止作弊的措施。