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【单选题】
下面是关于用已知浓度盐酸滴定未知浓度氢氧化钠溶液的酸碱中和滴定实验操作的叙述： ①取一锥形瓶，用待测NaOH溶液润洗两次． ②在一锥形瓶中加入25.00mL待测NaOH溶液． ③加入几滴石蕊试剂做指示剂． ④取一支酸式滴定管，洗涤干净． ⑤直接往酸式滴定管中注入标准酸溶液，进行滴定． ⑥左手旋转滴定管的玻璃活塞，右手不停摇动锥形瓶． ⑦两眼注视着滴定管内盐酸溶液液面下降，直至滴定终点． 其中所述操作有错误的序号为（ ）A.
①③⑤⑦
B.
①⑤⑥⑦
C.
③⑤⑦
D.
④⑥⑦
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