【单选题】The four basic components of a fire are fuel, heat, oxygen and a chain reactionWhich of the following statements best describes what must be eliminated to extinguish a fire?
A.
Any one component can be eliminated to extinguish a fire
B.
Any two components must be eliminated to properly extinguish a fire
C.
Any three components must be eliminated to properly extinguish a fire
D.
Ali four components must be eliminated to extinguish any fire
【简答题】Hybride composites combine two or more different fibers in a common matrix. The four basic types of hybrids are A) ______, B) ______, C) ______, and superhybrids.
【单选题】The contemporary legal systems of the world are generally based on one of four basic systems ( ), common law, statutory law, religious law or combinations of these.
【简答题】A.How to buy or sell shares. B.Basic knowledge of stock market. C.The stock market is like gambling. D.Investing money in the stock market is not the safest way.