题目

When you hear Westerners say “ Drop in anytime”（随时来玩）or “Come and see me soon”, you should realize that it doesn’t mean you are welcome to come over to their house anytime. It’s wise to telephone before visiting someone.Never accept an invitation unless you really plan to go. You may refuse by saying, “Thank you for inviting me, but I may not be able to come.” If you are unable to come after accepting the invitation, be sure to tell those who invite you in advance（提前）that you will not be there.When you have accepted the invitation to a party or a dinner, it 10．在花瓶中加入“鲜花保鲜剂”，能延长鲜花的寿命．表是500mL“鲜花保鲜剂”中含有的成分，阅读后回答下列问题：成分质量（g）摩尔质量（g•mol-1）蔗糖（C12H22O11）25.00342硫酸钾0.84174阿司匹林0.17180高锰酸钾0.316158硝酸银0.075170（1）配制1L上述“鲜花保鲜剂”所需的仪器有：量筒、玻璃棒、药匙、烧杯、托盘天平、胶头滴管、1000 mL容量瓶．（在横线上填写所缺仪器的名称）．（2）在溶液配制过程中，卜^列操作对配制结果没有影响的是BD．A．定容时俯视容量瓶刻度线B．容量瓶在使用前未干燥，里面有少量蒸馏水C．容量瓶在使用前刚刚配制完一定物质的量浓度的NaCl溶液而未洗净D．定容摇匀后发现液面低于容量瓶的刻度线，但未做任何处理（3）一鲜花保鲜剂”中K+（阿司匹林中不含K+）的物质的量浓度为0.0233mol/L．