问题
多项选择题
高聚物的合成反应按聚合反应机理可分为（）
A.加聚反应
B.缩聚反应
C.逐步聚合反应
D.连锁聚合反应
答案
参考答案：C, D
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高聚物的合成反应按聚合反应机理可分为（）
A.加聚反应
B.缩聚反应
C.逐步聚合反应
D.连锁聚合反应
参考答案：C, D
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| Here is a story about a clever dog. It was a seeing eye dog which can help blind people walk along the streets and do many other things. One day a seeing eye dog and a blind man 1 on a bus together. The bus was full of 2 and there were 3 seats left. But one man soon stood up and left his seat. The dog 4 the blind man to the seat, but there was little space for two people. The dog began to push the people on each side 5 his nose. He pushed and pushed until the people moved and 6 there was 7 space for two people. The blind man then sat down and the dog got up on the seat at his side. The dog 8 down and put his head on the leg of the 9 man. He was very comfortable and soon fell asleep. Everyone on the bus 10 at the dog. | ||||
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