第26题: [填空题]The discovery of stainless steel was the result of years of research by a well-known metallurgist who experimented with barrels made of steel alloys containing different percentages of chromium.
参考答案:N
第27题: [单项选择]接收环管紧急排放的排放罐是()。 A. D601 B. D602 C. D603 D. D604 参考答案:A
第28题: [单项选择]牛乳排空的时间() A. 1~1.5小时 B. 1.5~2小时 C. 2~3小时 D. 3~4小时 E. 4~6小时 参考答案:D