浇注位置选折原则有哪些？

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问题问答题简答题

浇注位置选折原则有哪些？

答案

参考答案：

（1）重要加工面朝下（2）大平面朝下（3）面积大薄壁放在下部（4）尽量采用立铸

综合

读图8，北京市气温年变化曲线和降水柱状图，回答问题（10分）

（1）北京市多年月平均最高气温出现在______月，约为______℃。月平均最低气温出现在______月，约为______℃。

（2）北京各月降水量_________（均匀或不均匀），降水最多的两个月是_______、______月，7月份降水量约为________mm。

（3）结合北京市的气温与降水量的季节分配情况，归纳北京市的气候特征为：

_________________________________________________________________________。

阅读理解

Colors		Different Meanings
Green		Green means “hope” in Ecuador. In the U.S., it’s a symbol of money and concern for the environment.
Purple		Purple is worn by kings and queens in Europe, while in Thailand, it’s worn by women whose husbands have died.
	Black		Black is the traditional color of mourning(哀悼) in the West. But on the Pacific islands of Melanesia, it’s a symbol of beauty and speed.
	White		White is considered a pure color and is worn at weddings in America. In parts of Asia, however, white is worn to funerals(葬礼) as a sign of winter, when everything is dead.
	Red		Red means “beautiful” in Russia, but in South Africa, it’s the color of mourning. In the United States, a bride would be criticized(批评) for wearing a red gown. In India or China, though, brides often wear red as a symbol of good fortune.