现代汉语的词汇特点是() ["单音词占优势","双音词占优势","语素都是单音节","广泛用词根复合法构词"]
广告策划的基础是() ["市场调查","广告定位","广告创意","广告效果测定"]
科技文件的更改制度应包括()等内容。 ["更改程序","更改原则","更改权限","更改方法","更改原因"]
The economy of Ireland has been traditionally agricultural,but since ()country.sindustrial base has expanded. ["the mid-1950s ","the mid-1960s","the 1970s ","the 1980"]
丙氨酸族,包括()、()、(),碳架来源是()。
原核起始tRNA,可表示为(),而起始氨酰tRNA表示为();真核生物起始tRNA可表示为(),而起始氨酰-tRNA表示为()。