以下对实验操作的说法正确的是（ ）
| A．由于合金中金属的活泼性不同所以合金都易生锈 |
| B．进行焰色反应时，所用铂丝先用NaOH溶液洗涤并充分灼烧 |
| C．配制FeCl3溶液时，应将FeCl3溶解在适量的HCl中 |
| D．酸碱中和滴定时，锥形瓶需用待测液润洗2遍，再加入待测液 |
相关试题
—— Do you mind my opening the window? It’s a bit hot in here.
—— ______ , as a matter of fact
| A．Go ahead | B．Yes, my pleasure |
C．Yes, I do | D．Come on |
It’s high time you had your hair cut ; it’s getting _______ . 
| A．too much long | B．much too long |
C．long too much | D．too long much |
My friend showed me round the town, ______ was very kind of him. 
| A．which | B．that | C．where | D．it |
They use computers to keep the traffic _______ smoothly.
| A．being run | B．run | C．to run | D．running |
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