根据给定资料,概括总结出现工程质量问题的主要原因。
要求:概括准确,语言简练,字数不超过250字。
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In this part, you are allowed to write a letter to the headmaster of your previous high school who has invited you to give a speech to your schoolmates, to explain for your failure to do this. You should
1) make an apologize to the school, because you can't make speech as planned.
2) explain the reason why you want to delay the plan. You should write about 100 words on ANSWER SHEET 2.
Do not sign your own name at the end of the letter. Use "Zhang Wei" instead. Do not write the address. (10 points)
根据材料6,毛泽东所讲的工业化道路是指什么?后来毛泽东对中国工业化道路探索又有哪些深化?