What maritime innovations and discoveries are attributed to Zheng He, who lived during the Ming dynasty?

A. Flexible rudder design, waterproof lacquers, triple sail system,
charting instruments
B. Charting of new sea currents, layered sails, stern rudders,
waterproof lacquers
C. Creation of new maps, central rudders, watertight compartments,
and advanced sails
D. Central rudders, watertight glass, triple sails, charted landscapes

What does the timeline above show about the consequences of the persian wars? a. each city-state of greece had equal influence after the wars. b. athens and sparta continued attacking persia after the wars had ended. c. persia continued to dominate greece for years after the wars. d. the alliance between athens and sparta ended shortly after the wars.

What was the main cause of the russian revolution? a. the protests against the war with poland b. the tremendous war losses of world war 1 c. the protests against the treaty of brest- litovsk d. the losses dictated by the treaty of versailles

Where did the term “iron curtain” originate? the warsaw pact used the term iron curtain as a code word for communism. in a 1946 speech, british prime minister winston churchill said an iron curtain had fallen across the continent of europe. while visiting western europe in 1946, u.s. president harry truman commented that the mountains there looked like iron curtains. russian general secretary joseph stalin instructed citizens of eastern europe to hang iron curtains over their windows to protect themselves from stray bullets.