The experiment has reached a stage ________ they can almost do nothing about it.   [ ]

A. which        

B. that        

C. where      

D. when

若某机关所办之事因缺乏一定的物力、财力或人力，需报请上级协助解决，应写哪一类请示？（）

A.求准性请示

B.求助性请示

C.求示性请示

D.帮助性请示