The XPS board was produced by Harbin Xin Hai Trading Co., Ltd. Its thickness is 10cm in the NSTIL, which was decided by the relevant research results [28]此句中,Its thickness is 10cm in the NSTIL中的is,和which was decided by中的was是不冲突?是不是要将is改成was才合适?
Students should have access to good resources, which ______ beneficial to their study. A. are B. is有的人认为要用单数,which 指前面的 have access to good resources;有人认为要用复数,which指good resources。您怎么看?求分析!谢谢!