One of the disadvantages of using carbon dioxide to extinguish a fire in an enclosed space is

A．the 'snow' which is sometimes discharged along with the gas is toxic

B．prolonged exposure to high concentrations of CO2 gas causes suffocation

C．rapid dissipation of the CO2 vapor

D．the CO2 gas is lighter than air and a large amount is required to extinguish a fire near the deck

[单选题]One of the disadvantages of traveling as an air courier is that he_____.A． cannot decide when and where to travelB． cannot take any luggage with himC． has to wear two pairs of jeansD． saves little money from the travel

Both the advantages and the disadvantages (1)_____ using foreign faculty in teac

"In the whole scheme of things, green roofs are not the one answer to sequesteri

"In the whole scheme of things, green roofs are not the one answer to sequesteri

"In the whole scheme of things, green roofs are not the one answer to sequesteri

[单选题]One limitation as to why using the average duration of the bonds in a portf

These days it is not uncommon for one to see people using()everywhere-even on ai

[单选题]Carbon is an element， while carbon dioxide is a( )A.materialB.substanceC.or

[单选题]Carbon is( )， while carbon dioxide is a compound.A.a materialB.a substanceC

[单选题]There are advantages and disadvantages to 21 Asian and Western educational method. For example, one advantage 22 the education in Japan is that students there learn much more math and science 23 American students. They also study more hours each day