下列属于正确的核聚变方程的是 A: 1H + 2H → 3He B: 2H + 3H → 4He + n C: 2H + 3H → 3He D: 1H + 2H → 4He + n
下列属于正确的核聚变方程的是 A: 1H + 2H → 3He B: 2H + 3H → 4He + n C: 2H + 3H → 3He D: 1H + 2H → 4He + n
以下哪个核聚变方程是安全的，不会产生辐射粒子泄露的危险 A: 2H + 3H → 4He + n B: 2H + 2H → 3He + n C: 2H + 2H → 3H + 1H D: 2H + 3He → 4He + 1H
以下哪个核聚变方程是安全的，不会产生辐射粒子泄露的危险 A: 2H + 3H → 4He + n B: 2H + 2H → 3He + n C: 2H + 2H → 3H + 1H D: 2H + 3He → 4He + 1H
4 He can’t drive; he’s ________ 15.
4 He can’t drive; he’s ________ 15.
4) He is not only a good designer, but he is also a good manufacturer.
4) He is not only a good designer, but he is also a good manufacturer.
4 He works on Sundays. (even) ________________
4 He works on Sundays. (even) ________________
He _____ in Class 4, Grade 1.
He _____ in Class 4, Grade 1.
If he[input=type:blank,size:4][/input](be) careful, he[input=type:blank,size:4][/input]( have)that terrible accident.
If he[input=type:blank,size:4][/input](be) careful, he[input=type:blank,size:4][/input]( have)that terrible accident.
低温下的4He、光子气和电子气等服从玻兹曼分布定律。
低温下的4He、光子气和电子气等服从玻兹曼分布定律。
4、 He called to say he would be late home—something had come _____ at the office 。
4、 He called to say he would be late home—something had come _____ at the office 。
α衰变发射出的粒子为（） A: 2H核 B: 3H核 C: 3He核 D: 4He核
α衰变发射出的粒子为（） A: 2H核 B: 3H核 C: 3He核 D: 4He核