问题
单项选择题
仪崩低压管网来分配和供给燃气，一般只适用于小城镇的供气，这种燃气管网系统称为()。
A.一级系统
B.二级系统
C.三级系统
D．多级系统
答案
参考答案：A
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仪崩低压管网来分配和供给燃气，一般只适用于小城镇的供气，这种燃气管网系统称为()。
A.一级系统
B.二级系统
C.三级系统
D．多级系统
参考答案：A
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| Once there was a father and a son. They were ill-tempered (坏脾气的) and never gave way to 1 . One day the father 2 to ask some friends to dinner in his house. He 3 his son to buy some meat in town. When the son walked towards the town gate, a man was coming from the outside. The gate wasn't 4 enough to let two men in and out at the same time. But neither of 5 would give way to the other. They stood straight face to face inside the gate hour after hour. But the father was worried. "What shall I do? My son hasn't 6 yet. I can't wait any more." He wanted to know what was the 7 with his son. So he left his friends at home,and went to town 8 his son. "You may first take the 9 home for my friends. Let me 10 here against him instead." he said to his son when he knew what had happened. | ||||
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