对于灰度图像来说，颜色深度决定了该图像可以使用的亮度级别数目。
The datum from which the predicted heights of tides are reckoned in the tide tables is（）. ["mean low water","the same as that used for the charts of the locality","the highest possible level","given in table three of the tide table"]
Domestic water pump is started automatically by （） which operates as the water level falls to a predetermined level. ["a level controller","a temperature switch","a pressure switch","a floating ball"]
简述沙市刺棘头病的病原。
开户行在为企业办理网上银行注册登记的业务操作过程中，要严格执行（），相互复核，降低银行业务操作风险。 ["权限管理","双人操作","内部传递","发放登记"]
在每天进行工作前要进行哪些检查工作？
