Question:
Choose your answer: Is "The bitumen content varies from 83% to 92% (soluble in carbon disulphide), with a penetration value near to zero and a softening point (ring & ball) around 120 C." a good answer to the question "What is the variance in bitumen content rock asphalt?"
Answer:
yes

Question:
Choose your answer: Is "The simplest method, used for small-scale production and often by hobbyists, is immersion etching, in which the board is submerged in etching solution such as ferric chloride." a good answer to the question "What non-professionals might use immersion etching, since it's the easiest way to make a PCB?"
Answer:
yes

Question:
Choose your answer: Is "After the death of the king Ferdinand VII, in 1833, only Cuba and Puerto Rico remained under Spanish rule, until the SpanishAmerican War in 1898." a good answer to the question "When did the Spanish-American war occur?"
Answer:
yes