已知在碱性溶液中可发生如下反应：2R(OH)3+3ClO-+4OH-═2RO4n-+3Cl-+5H2O，则RO4n-中R的化合价是
| A．+3 | B．+4 | C．+5 | D．+6 |
相关试题
What I need is_____ book that contains ______ABC of oil painting.
| A．a; 不填 | B．the; 不填 | C．the; an | D．a ; the |
Jenny nearly missed the flight______ doing too much shopping.
| A．as a result of | B．on top of | C．in front of | D．in need of |
The CDs are on sale! Buy one and you get ______ completely free.
| A．other | B．others | C．one | D．ones ks |
I’m sure that your letter will get______ attention. They know you’re waiting for the reply. 
| A．continued | B．immediate | C．careful | D．general |
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