To show our respect, we usually have to 发布时间:2017-05-18 19:19 │ 来源:www.tikuol.com 题型:选择题 问题: To show our respect, we usually have to take our gloves off _____ we are to shake hands with. A. whichever B. whenever C. whoever D. wherever
题型:选择题 60钴机的工作环境的要求是()。A.环境温度15~35℃,相对湿度30%~75%B.环境温度10~20℃,相对湿度30%~60%C.环境温度10~15℃,相对湿度30%~80%D.环境温度10~25℃,相对湿度30%~70%E.环境温度15~25℃,相对湿度20%~60% 查看答案