Which is a benefit of using the IBM DS8000 FlashCopy SE （PTC-SE）（） ["FlashCopy SE （PTC-SE） is much faster than the traditional DS8000 full-volume FlashCopy","FlashCopy SE （PTC-SE） also supports background copy","FlashCopy SE （PTC-SE） is optimized for use in cases where a high percentage of the source volume is updated during the life of the relationship","the additional capacity required forFlashCopy SE （PTC-SE） must only be planned for data which is changed on the source volume during host I\/O transactio"]
120-1型控制阀作用部由（）、主膜板、0形橡胶密封圈、滑阀销、滑阀、节制阀、滑阀弹簧、节制阀弹簧、稳定杆等组成。 ["涨圈","减速弹簧","主活塞","递动杆"]
下列荷载中，属于水平荷载的是（）。 ["结构自重","雪荷载","风荷载","积灰荷载"]
国家测绘局自受理注册测绘师资格注册的申请材料材料之日起多少工作日内作出审批决定（） ["5个","10个","20个","30个"]
DS3000分区扩展授权，最多可支持16个分区，这个说法对否？
请简述在攀爬机组塔架时应注意的事项.
