简答题The electrochemical cells can convert ________ into _______ . A、chemical, electric B、electric, chemical C、mechanical, electric简答题Heavy molecules need higher temperature to overcome their stronger_________. A、 ionic bonds B、 covalent bonds C、intermolecular forces简答题Nucleons on opposite sides of a large nucleus are not as close to one another, and so the attractive strong nuclear forces holding them together are_______. A、much stronger B、equal C、much weaker简答题The main component of petroleum is_______. A、carbon oxides B、hydrocarbons C、hydronitrogens简答题Photosynthesis is a kind of _______conversation. A、photothermal B、photoelectric C、photochemical简答题The function of a hydropower station is to___________. A、 Convert potential energy into electric energy B、Convert electric energy into potential energy C、 Convert water energy into electric energy简答题Electricity is the most _______ form of energy to use. A、unusual B、expensive C、convenient简答题A、1V B、 0V C、 0.1V简答题The energy that the sun radiates to the earth's surfaces every is 50 ′1018 KJ which is___________times the current energy consumption in the world. A、130 B、1300 C、13000简答题If controlled slowly release in the nuclear fission reaction the nuclear energy can be transferred to________. A、wind energy B、 solar energy C、electricity多选题A、 B、 C、简答题In the transportation field which is not from the application of solar cell? A、 Traffic light B、 Highway wireless telephone C、The engines of buses简答题Natural gas is primarily_______. A、ethane B、propane C、methane简答题What is the anode reaction of Mercury Batteries? A、 B、 C、简答题In the communication field, which is not from the application of solar cell? A、Microwave relay station B、Optical cable maintenance C、Wired telephone简答题The half life of C14 is._______. A、 B、 C、简答题Biomass energy produced _________ mainly in the process of burning. A、 B、 C、简答题Nuclear fusion will release ______ nuclear fission. A、equal energy to B、more energy than C、less energy than简答题The biomass energy is the solar energy stored in biomass in the form of ________ energy though photosynthesis directly or indirectly. A、chemical B、mechanical C、thermal简答题Hydrogen is the most common element in the nature _______ of the mass of the universe. A、75% B、60% C、40%