脂肪酸败后,最早期的鉴定指标是()。
A.比重升高
B.凝固点下降
C.颜色变浅
D.过氧化值升高
E.产生气泡
参考答案:D
解析:脂肪酸败后,最早期的鉴定指标是过氧化值升高。
单词拼写:根据汉语注释及首字母写出空缺处各单词的正确形式。(每空只写一词)
1. The bags on _____ (销售) are fifteen yuan each.
2. My sister likes to go to that _____ (服装) store to buy clothes.
3. The boy in _____ (白色的), not the one in black, is his cousin.
4. You can buy the shirt for eight _____ (美元) or twenty RMB yuan.
5. They _____ (卖) the soccer balls for only ¥40.
6. Green, yellow, black and red are all c____.
7. The white pants are too s____ for Jim, but the black pants are too long for him.
8. Come and see for y____ at Xingfu Clothes Store.
9. —What's the p____ of this bird?
—It's 100 yuan.
腐蚀疲劳是应力腐蚀开裂的特殊形式之一。在腐蚀介质和周期交变应力的相互作用下导致金属材料的疲劳极限大大降低,因而过早地破裂。