| People appear to be born to compute. The numerical
skills of children develop so early and so inexorably that it is easy to imagine
an internal clock of mathematical maturity guiding their growth. Not long after
learning to walk and talk, they can set the table with impressive accuracy one
plate, one knife, one spoon, one fork, for ’each of the five chairs. Soon they
are capable of noting that they have placed five knives, five spoons, and five
forks on the table and, a bit later, that this amounts to fifteen pieces of
silverware. Having thus mastered addition, they move on to subtraction. It seems
almost reasonable to expect that if a child were secluded on a desert island at
birth and returned seven years later, he or she could enter a second-grade
mathematics class without any serious problems of intellectual
adjustment. O A. the quantity of the water unchanged B. the color of the water changed C. the quantity of the water changed D. the quantity of the water became more [判断题]信道编码的作用是把连续消息变换为数字信号。
[判断题]继电保护现场工作至少应有两人参加。
A.正确 B.错误 [判断题]在一些企业生产和工程建立承包中，发包人〔甲方〕与承包人〔乙方〕签订伤亡事故合同时，规定假设发生伤亡事故，由乙方自行负责，甲方只赔偿一定的费用。这种合同是无效的，但经过主管部门批准或公证后有效。
A.正确 B.错误 [多项选择]普洱茶紧茶依形状不同有（）。
A. 沱茶 B. 七子饼茶 C. 砖茶 D. 圆茶 [单选题]用于（）电压等级时，绝缘隔板的厚度不得小于3mm。
A.10kV B.35kV C.110kV D.66kV [多项选择]适用于破伤风的药物是（）
A. 荆芥 B. 防风 C. 白芷 D. 蝉蜕 E. 薄荷 [判断题]美国是最早为中国抗日战争提供援助的国家。()
A.正确 B.错误 [判断题]人民警察对实施爆炸犯罪行为后拒捕的犯罪分子，经警告无效，可以使用武器。
正确 错误 A.正确 B.错误 [简答题]简述小儿肺炎并发急性心力衰竭的主要原因、临床表现及治疗原则。
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