Samuel Langley
A) was not successful in attempts at unpiloted powered flight.
B) successfully flew a piloted powered airplane before the Wright brothers.
C) was never successful in attempts at powered flight.
D) successfully flew an unpiloted powered aircraft before the Wright brothers' flight.
Answer: D
You might also like to view...
Sometimes research participants in treatment groups have diverse perspectives when providing subjective ratings, so differences between groups might occur because of those perspectives rather than to an experimental treatment
You can reduce this problem by using a. complete counterbalancing designs. b. between subjects designs. c. nonequivalent control groups designs. d. repeated measures designs.
According to most interest-group leaders, which type of incentive draws in the most members?
A. monetary B. idealist C. fixed D. relegated E. social
Before the year ______, the U.S. Census Bureau did not allow respondents to choose more than one racial category; however, they would be included in the least empowered group
Fill in the blank(s) with correct word
Passage of various government regulations from the Food & Drug Administration illustrated the federal government's commitment to
A. environmental conservation B. workers' rights C. business competition D. consumer protection