question:
For this reason it has long been used to line parts of ships to protect against barnacles and mussels.
What has pure copper been replaced with in the building of ships?

answer: no

question:
Also around this time, he was offered a post by the Philippine Commonwealth Government, namely by then Philippine President Manuel L. Quezon on recommendations by MacArthur, to become the chief of police of a new capital being planned, now named Quezon City, but he declined the offer.
Who was president of the Philippines circa 1939?

answer: yes

question:
An advantage of the universal motor is that AC supplies may be used on motors which have some characteristics more common in DC motors, specifically high starting torque and very compact design if high running speeds are used.
How is stepped speed control achieved?

answer: no

question:
Due to its very-high strength and toughness (which is much higher than pure iron), and its ability to be greatly altered by heat treatment, steel is one of the most common alloys in modern use.
What is another word for when alloys solidify?

answer:
no