阿摩線上測驗
41. Which of the following is true about Dr. Cizmar’s tractor beam?
(A) It moves big objects as the tractor beam did in Star Trek.
(B) It is the first light beam device that pushes objects forward.
(C) It relies on negative force to pull out specific kinds of particles.
(D) It is currently being used for separating blood cells in medical research.
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統計： A(2), B(12), C(32), D(6), E(0) #617498
統計： A(2), B(12), C(32), D(6), E(0) #617498
