干熄焦年修后温风干燥阶段时,预存室放散阀处于()状态,环境除尘集尘阀处于()状态。()
A. 关闭;开启
B. 开启;开启
C. 开启;关闭
D. 关闭;关闭
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墙面阴阳角的细部处理方法有:对接法、弧形转角、方块转角、斜面转角、企口、斜接与()等。
事故发生后,有关单位和人员应当妥善(),任何单位和个人不得破坏事故现场、毁灭相关证据。
A. 处理现场
B. 保护事故现场
C. 搜集证据
D. 相关证据
Your vessel is anchored in an open roadstead with three shots of chain out on the port anchor.The wind freshens considerably and the anchor begins to drag.Which action should you take FIRST().
A. Drop the starboard anchor short with about one shot of chain
B. Sheer out to starboard using the rudder,then drop the starboard anchor with about four shots of chain
C. Put the engines slow ahead to help the anchor
D. Veer out more chain on the port anchor
三重DES加密时,使用的密钥数量为()
A. 4个
B. 3个
C. 2个
D. 1个