下列说法中正确的是
A．α粒子散射实验发现了质子
B．玻尔理论不仅能解释氢的原子光谱，也能解释氦的原子光谱
C．热核反应的燃料是氢的同位素，裂变反应的燃料是铀
D．中子与质子结合成氘核的过程中需要吸收能量
答案：C
题目分析：卢瑟福通过α粒子散射实验否定了汤姆生的枣糕模型，从而提出了原子核式结构模型，质子的发现是卢瑟福通过α粒子轰击氮核而发现质子，选项A错。波尔理论把原子能级量子化，目的是解释原子辐射的线状谱，但是波尔理论只能很好的解释氢原子的线状谱，在解释氦的原子光谱和其他原子光谱时并不能完全吻合，选项B错。热核反应主要是氘核氚核在高温高压下发生的聚变反应，氘核和氚核都是氢的同位素，裂变主要是铀核裂变，选项C对。中子和质子结合成氘核是聚变反应，该过程释放能量，选项D错。
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| eBooks still some way away from students Twelve-year-old Tang Yin is one of the earliest students to test a digital textbook in China. The boy said he was a little 1 when he received the monochromatic (单色的) flat device in April, 2010, because he thought it should be a " 2 cool" laptop. But Tang still cherishes (珍爱) his new equipment like "protecting my 3 ," said the fifth grader. After all, not every student has the opportunity to 4 the eBook, which is worth 2,000 yuan, he said. The 50 eBooks, 5 by Taiwan eBook manufacturer Chuanqi Photoelectric Technology in Yangzhou, Jiangsu Province, enable one class at Yangzhou Sanyuanqiao Elementary School to be the 6 group of students in the Chinese mainland to replace their regular textbooks with electronic ones. Out of l,000 students, Tang' s class was the lucky 7 . "Our school could not 8 the project without the company' s donation," said Yuan Shishan, vice-headmaster of the primary school 9 the digital book is considered environmentally friendly, because it replaces paper books and saves money in the long run, the price is much higher than most Chinese 10 can afford. Also, some technical defects, the 11 of taking notes and monochromatic display, make the eBook fail to meet the expectations of students and teachers. "There's still a(n) 12 way to go before the eBook really plays an important role in education," said the headmaster. According to Yuan, the annual average income of a 13 family in Yangzhou is about 20,000 to 30,000 yuan, and neither the parents nor the school can afford the 2,000 yuan 14 book. The school doesn't allow the students to take their eBooks to their homes. The devices are 15 after class, and are locked in the headmaster's office. | ||||
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