问题
多选题
关于库仑定律和万有引力定律，下列说法中正确的[ ]
A．静电力和万有引力都是通过直接接触而引起的
B．库仑定律和万有引力定律分别只适用于点电荷之间和质点之间的相互作用
C．带电体都有质量，因此它们之间除了静电力外，还存在万有引力
D．氢原子中的电子和原子核之间既存在静电力，也存在万有引力
答案
BCD
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关于库仑定律和万有引力定律，下列说法中正确的[ ]
A．静电力和万有引力都是通过直接接触而引起的
B．库仑定律和万有引力定律分别只适用于点电荷之间和质点之间的相互作用
C．带电体都有质量，因此它们之间除了静电力外，还存在万有引力
D．氢原子中的电子和原子核之间既存在静电力，也存在万有引力
BCD
Diane Ray was completely self-centered and very spoilt. Her parents gave her 36 she wanted, knowing that she would throw a temper tantrum(耍小孩脾气)if they did not. She would scream and kick and 37 on the floor drumming her heels. Her parents always 38 . That was why she was alone on the 39 , wearing an expensive swimsuit. It has taken a massive tantrum to 40 her parents to buy it. They were back at the beach-house, 41 from the tantrum she had thrown when they told her that it was too dangerous to go diving 42 . “Dangerous?” she had said. “You just don’t want me to have 43 . I’m going and if you try to stop me, I’ll scream.” “What are you doing ?” a voice asked. Diane jumped. She did not know that the man was there 44 he spoke . “I’m going diving, ” she answered. “You shouldn’t swim that day, ” the man 45 . “There is a storm coming up.” “You should mind your own 46 !” Diane replied and walked into the gentle waves. “If you go out there you’ll be 47 ,” the man called after her. She did not bother to reply. Diane slipped into the water and dived 48 until white caps began rolling in and it became harder to 49 against the current (水流). Saltwater hit against her face, making it 50 to breathe. Oh, why had she not listened to advice. Panicking, she began to 51 . Then, just as it seemed as if she would slip beneath the surface, she heard a 52 voice. “Hold on ! I’m coming.” With 53 , she saw the old man rowing an ancient-looking boat towards her. “I hope you’ve learned a lesson. You put us both in 54 , ” he shouted angrily, as he dragged her over the side of the 55 . Gratefully, Diane thanked him and ran towards the beach-house.
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