【多选题】回复以下提问时,哪几个选项应该重读? ——Is she hard-working? ——No, I don’t think so. She needs to work harder.
【多选题】回复以下提问时,哪几个选项应该重读? —-How's every thing? —-Um... fine. I have been too much busy with my papers.
【多选题】数据结构包括了数据的逻辑结构、存储结构和对数据的操作。数据的逻辑结构可以分为____等
【多选题】回复以下提问时,哪几个选项应该重读? ——Have you ever tried that exam? ——Yes, I have. I don’t think it’s an easy one.
【单选题】已知H3PO4的Ka1 = 7.6×10-3, Ka2 = 6.3×10-8, Ka3 = 4.4×10-13,若以NaOH溶液滴定H3PO4溶液,则第二化学计量点的pH约为