问题
选择题
The post office is far from here. You can get there _____________.
A. take a bus
B. take the bus
C. by bus
D. by a bus
答案
答案:C
The post office is far from here. You can get there _____________.
A. take a bus
B. take the bus
C. by bus
D. by a bus
答案:C
用下表提供的仪器和药品,能达到实验目的的是
编号 | 仪器 | 药品 | 实验目的 |
A | 烧杯、分液漏斗、胶头滴管、铁架台 | 待提纯的AlCl3溶液、NaOH溶液 | 提纯混有MgCl2杂质的AlCl3溶液 |
B | 分液漏斗、烧瓶、锥形瓶、导管及橡皮塞 | 盐酸、大理石、 碳酸钠溶液 | 证明非金属性:Cl>C>Si |
C | 酸式滴定管、胶头滴管、铁架台(带铁夹) | 已知浓度的盐酸、 待测NaOH溶液 | 测定NaOH溶液的物质的量浓度 |
D | 酒精灯、玻璃棒、 蒸发皿、铁架台(带铁圈) | NaCl溶液 | 蒸发溶液得到晶体 |