There are two disadvantages to CO2 pump as a firefighting agent. One of these is the limited quantity available，and the other is（）.
1、There are two classes of vessels which
There are two classes of vessels which，to the extent necessary to carry out their work，do not have to comply with the rule regarding traffic...
2、There are two syllables in the word "m
There are two syllables in the word "motto". / əu / occurs in both syllables，but the first one is longer than the second because___.Ait is stressedBit comes before a consonantCit is in the first syllableDit comes between two consonants
3、In a two-stroke engine, there are alwa
In a two-stroke engine, there are always a series of openings known as （）, and in some circumstances, there are also openings known as （）...
4、In general, there are two parts in an
In general, there are two parts in an SES, One of these is antenna eqipment also referred to as（）.ABDEBUDECAEPDADE
5、There are two syllables in the word "m
There are two syllables in the word "motto". /:əu/ occurs in both syllables， but the first one is longer than the second because___.Ait is stressedBit comes before a consonantCit is in the first syllableDit comes between two consonants
6、In motorships，there are two main circu
In motorships，there are two main circuits, （）.Aone salt water, one fresh waterBone salt water, one fuelCone fresh water, one fuelDone steam, one fuel