题目内容
汽蒸的原则是：加水量要少，防止串味和跑汽，要掌握好加热时间。
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Human beings are animals. We breathe, eat and digest, and reproduce the same life (21) common to all animals. In a biological laboratory rats, monkeys, and humans seem very much the same. However, biological understanding is not enough: (22) itself, it can never tell us what human beings are. (23) to our physical equipment the naked human body--we are not an (24) animal. We are tropical creatures, (25) hairless and sensitive to cold. We are not fast and have neither claws nor sharp teeth to defend ourselves. We need a lot of food but have almost no physical equipment to help us get it. In the purely physical (26) , our species seems a poor (27) for survival. But we have survived--survived and multiplied and (28) the earth. Some day we will have a (29) living on the moon, a place with neither air nor water and with temperatures that turn gases into solids. How can we have done all these things Part of the answer is physical. (30) its limitations, our physical equipment has some important (31) . We have excellent vision and hands that can (30) objects with a precision unmatched by any other (33) . Most importantly, we have a large brain with an almost (34) number of neural (35) .
火电厂二次回路自动开关额定电流的选择。 电压互感器二次侧自动开关瞬时脱扣器断开短路电流的时间应不大于( )。
发电厂和变电所的控制电缆和绝缘导线按机械强度要求。 强电控制回路导体截面(铜芯)应不小于( )。
我国经济发展全局中的关键环节是发展农业。 ( )
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