-- Are you going to Sam's birthday party the day after tomorrow?
-- I'm not sure. I will go with you if I _______.
A:will invite
B:invite
C:will be invited
D:am invited
如图,合金块重为6N,密度为8×103kg/m3,杠杆OA能绕着O点转动,OA=60cm,OB=20cm.不考虑测力计的重,g=10N/kg.问: