A：将固体加入容量瓶中溶解并稀释至刻度线，配制成一定物质的量浓度的溶液
B：向盛有NaOH的烧杯中加蒸馏水使其溶解，并立即转入容量瓶中
C：用托盘天平称取10.60 g的Na2CO3固体，溶于1 L的水可配成0.1 mol/L的溶液
D：检查容量瓶是否漏水的方法是：往容量瓶中加水，塞好瓶塞，将容量瓶倒过来，若不漏水，将瓶塞旋转180°，再倒过来，看是否漏水
已知点A（1，3），B（4，﹣1），则与向量AB→方向相反的单位向量的坐标为____
根据短文内容及所给首字母，将正确的单词写在答题卷上 James works in a food shop. He helps the shopkeeper. He puts f____ on the shelves every day. Then people come into the shop and buy the food. Today there aren’t any bags of flour(面粉) on the shelf.“James,” says the shopkeeper. “We n____ some flour. Bring some bags of flour to the shelf. Hurry up!” James runs to get some bags of flour. They are in another room and they are on the top shelf. The shelf is high up. James is tall b____ he can’t reach the bags. James bring two boxes and puts one b____ on the other. Then he stands on them. Now he c____ reach(够到) the bags on the shelf.
