题目内容

预吹氩、加废钢调温或调合金时均采用强搅拌（）

查看答案

搜索结果不匹配？点我反馈

更多问题

网络信息检索策略制定遵循四个原则，一是快、二是准、三是全、四是效益原则（）

U.S. News ____________ rankings of colleges since 1983. They are a very popular resource for students looking to apply to university campus.

A. maintains
B. is maintaining
C. maintained
D. has been maintaining

“藏书楼”不可以作为中国古代各种书处所的统称（）

It _______ for two hours now

A. rains
B. is raining
C. has rained
D. has been raining