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举一反三
【单选题】qz149: 某加速器将电子加速到能量E = 2×106 eV时,该电子的动能EK =( )eV。(电子的静止质量me = 9.11×10-31 kg, 1 eV =1.60×10-19 J)
A.
2.49×106
B.
1.49×106
C.
1.67×106
D.
2.67×106
【单选题】Passage Two:Questions 26 to 30 are based on the following passage.If you want to stay young, sit down and have a good think. This is the research finding of a team of Japanese doctors, who say that mo...
A.
why certain people age sooner than others
B.
how to make people live longer
C.
the size of certain people’s brains
D.
which people are most intelligent
【单选题】设备是在各种不同的环境条件下运转的，承受着各种（ ）与能量的作用，这些作用会使设备的技术状态发生变化，设备的性能劣化，最终导致设备发生故障。
A.
应力
B.
力量
C.
能量
D.
压力