【简答题】A.are involved B.involved C.involve D.have involved
【判断题】在选择氧化还原指示剂时,指示剂变色的电位范围应落在滴定的突跃范围内,至少也要部分重合。
【单选题】茚三酮试剂与下列药物成分显蓝紫色的是()。
【单选题】金属在结晶时,冷却速度越快,过冷度越大,所获得的晶粒越细小,材料的强度硬度越高,塑性韧性越好,我们把这种强化称之为( )。
【判断题】在选择氧化还原指示剂时,指示剂变色的电势范围应落在滴定的突跃范围内,至少也要部分重合。
【单选题】( )6.So involved with their computers________that leaders at summer computer camps often have to force them to break for sports and games.
C.
had the children become
D.
do the children become
【单选题】So involved with their computers________that leaders at summer computer camps often have to force them to break for sports and games.
C.
had the children become
D.
do the children become