划分等级的标准是()
中共十七大报告指出,发展中国特色社会主义的一大“法宝”是()
John complained to the bookseller that there were several pages______ in the dictionary.
什么是相对静止?承认相对静止有何意义?
The ukulele is a ________ instru ment, which resembles a guitar.
在社会保障制度中,社会保障费用应改为由()