The FIRST course of action in fighting a fire in a cargo or fuel oil tank is to _____.
A. secure all openings to the tank
B. discharge an initial charge of CO2 with a hand portable extinguisher
C. direct a fire hose into the tank and energize the fire main
D. spray the tank boundaries with a fire hose to promote cooling
查看答案
Access提供的数据访问页的三种视图分别是（)视图、（)视图、（)视图。
在关系数据的基本操作中把两个关系中相同属性值的元组联接到一起形成新的二维表的操作称为（).
微信支付 
支付宝支付