| (1) control experiment: in the investigation of a certain condition on the object of study, the object of study in addition to the conditions of the different, other conditions are the same experiment. According to the variables set up a set of controlled experiments, so that the experimental results are persuasive. Generally speaking, the experimental group is the one that treats the experimental variables. Those without treatments are the control group. Analyze the contents of the table can be seen, A and B is a set of control experiments, A in water, B drying, no water, the variable is water. A and C is also a set of control experiments, A temperature is appropriate, C temperature is low, the variable temperature. A is the experimental group, BC are respectively the control group. (2) the principle of preventing food spoilage are to kill or inhibit the growth and reproduction of bacteria, fungi, low temperature in the refrigerator, can inhibit the growth and reproduction of bacteria, fungi and other micro-organisms, so that their reproduction rate is slow, the number of less, can not be sufficient to decompose the food, so as to achieve the purpose of preservation of freshness. (3) The organisms in the figure is Penicillium, its spores are radial, belong to the fungi, fungi have a real nucleus, and bacteria in the structure of the biggest difference is that bacteria have no formed nucleus, only the concentration of DNA. (4) fermentation technology in the production of food is of great significance, fermentation technology refers to the use of microbial fermentation, the use of a number of technical means to control the fermentation process, large-scale production of fermented products technology. The use of molds to produce antibiotics (such as penicillin) belongs to the technology of fermentation. The answer is: (1) B; water (also C; temperature) (2) low temperature inhibits the growth and reproduction of bacteria and fungi (3) formed nucleus (4) fermentation |