氧化锌丁香油水门汀凝固时间过长。增加下列哪一种成份可加快其凝固()。
A.松香
B.氧化铝
C.硬脂酸锌或醋酸锌
D.橄榄油
E.都不正确
参考答案:B
Translate the sentences into Chinese.(请把下列句子翻译成汉语。)
1. One day, robots will do everything.
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2. Will they do the housework?
3.They will help children learn.
4.The robot can walk and talk!
洗手前准备哪项不妥
A.洗手前30min换好洗手衣、裤、鞋
B.洗手衣下摆放入裤腰内
C.戴帽子、口罩、修剪指甲
D.洗手衣的袖口应卷至肘上5cm
E.洗手前应打开洗手刷盒盖和泡水桶盖