【单选题】(2013·高考浙江卷)People develop ________ preference for a particular style of learning at ________ early age and these preferences affect learning.
【判断题】判断:在被测试液中,加入已知量过量的标准溶液与被测物反应完全后,再用另一种标准溶液滴定第一种标准溶液的余量,这种滴定方法为返滴法。( )
【单选题】信息资源有多种类型,如果按照文献的载体分,那么文献资源类型可以分为
【简答题】按照科技文献的载体类型,可划分为:( )、( )、机读型和声像型。
【简答题】(2013·高考浙江卷)The museum will open in the spring with an exhibition and a viewing platform ________ visitors can watch the big glasshouses being built. A.what B.where C.when D.why
【判断题】在进线间缆线入口处的管孔数量应留有充分的余量。