银行汇票凭证号码为（）位。 ["8位","10位","12位","16位"]
如何检修电动机？
Multiple fire pumps may be used for other purposes provided that one pump is（）. ["on line to the fire main","kept available for use on the fire main at all times","capable of being connected to the fire main","rated at or above 125 psi"]
Windows 2003计算机的管理员有禁用账户的权限。当一个用户有一段时间不用账户（可能是休假等原因），管理员可以禁用该账户。下列关于禁用账户叙述正确的是（）。 ["Administrator账户可以禁用自己，在禁用自己之前应该先创建至少一个管理员组的账户","普通用户可以被禁用","Administrator账户不可以被禁用","禁用的账户过一段时间会自动启用"]
Large volumes of carbon dioxide are safe and effective for fighting fires in enclosed spaces，such as in a pumproom，provided that the（）. ["persons in the space wear gas masks","persons in the space wear damp cloths over their mouths and nostrils","ventilation system is secured and all persons leave the space","ventilation system is kept operating"]
如何检修主回路？
