单项选择题
A. reader
B. author
C. manager
D. designer
单项选择题 lisaiswritingaformulatodeterminethenumberofelementsinalist.shewantstoensurethatavalueisreturned,evenifthevalueherfunctionisevaluatingturnsouttobeanullstring.whichoneofthefollowingcanshesotoaccomplishthis?（）
单项选择题 whenrobertcreatedaresponseform.hesetthe"formulasinheritvaluesfromselecteddocument"optionontheformproperties,thefieldnameonthereviewformisthesameasthefieldnameontheinheritingform,howevertheformdoesnotinheritanydata,why?（）
单项选择题 whichoneofthefollowingisan@fuctionthatLonniecanusetoreturnthevaluefromaspecificfield?（）