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为了保证船舶航行安全,首先要确定船舶的航向与位置。船舶定位方法按照参照目标可分为( )。

Do we call a large fire an “incident” or a kind of “disaster”?
Oil fires are best extinguished by().
An advantage of a dry chemical over a carbon dioxide fire extinguisher is its().
An advantage of a dry chemical over a carbon dioxide fire extinguish is its().
When there is a fire in a large electric motor, normally the very FIRST step is to ()
Water is a very effective fire extinguishing agent because it()
The class of fire on which a blanketing effect is essential to extinguish the fire is ().
Which extinguishing agent is the best for use on electrical fires?()
How does foam extinguish an oil fire?()
The fire of fuel oil is classified as() fire.
A foam-type portable fire extinguisher is most useful in fighting a fire in().
If a CO2 fire extinguisher is not readily available, which of the listed fire extinguishers would be best suited to combat a small electrical fire in a switchboard?()
Foam extinguishes a fire by().
Foam extinguishes a fire by().
Except in rare cases,it is impossible to extinguish a shipboard fire by().
Except in rare cases, it is impossible to extinguish a shipboard fire by ().
Except in rare cases,it is impossible to extinguish a shipboard fire by().
Except in rare cases,it is impossible to extinguish a shipboard fire by().
Except in rare cases, it is impossible to extinguish a shipboard fire by ().
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