消失模铸造缺点有哪些?
主要缺点是浇注时塑料模气化有异味,铸件容易出现与泡沫塑料高温热解有关的缺陷,如铸件容易产生皱皮、夹渣等缺陷,铸钢件可能稍有增碳。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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