填写工作票时，有个别错漏字需要涂改，应做到被改的字和改后的字清楚可辩，并在涂改处加盖涂改人的印章或手印。每张工作票涂改字迹不准超过（）个，工作票中的设备名称、编号、KKS编码、压板、接地线及其悬挂位置不准涂改。 ["1","3","4","5"]
液化石油气具有易燃易爆性、（）、溶解性。 ["易挥发性","不易挥发性","剧毒性","麻醉性"]
证券业务系统包括证券登记子系统、（）、结算子系统、核算子系统、通信子系统、运行管理子系统、信息管理子系统。 ["查询子系统","报表管理子系统","证券交易子系统","安全子系统"]
The insertion of shims between the foot of a marine type connecting rod and a bearing box would result in （） ["increased compression ratio","decreased compression ratio","increased bearing clearance","decreased bearing clearance"]
The velocity of a rotary tidal current will be decreased when the Moon is（）. ["at apogee","new","full","All of the above"]
发生炉煤气的危险性是什么？
