有甲、乙、丙三种盐水，甲种盐水含盐量为2%，乙种盐水含盐量为5%，丙种盐水含盐量为6%．现在要用这三种盐水中的一种来加水稀释，得到含盐量为4%的盐水60千克，如果这项工作让你去做，你打算取____ 种盐水，取____ 千克，加水____ 千克．

    Food is very important. Everyone needs to 1 well if he or she wants to have a strong body. Our minds also need a kind of food.

    This kind of food is 2.We begin to get knowledge even when we are very young. Small children are 3 in everything around them.They learn 4 while they are watching and listening.When they are getting older，they begin to 5 story books，science books...，anything they like.When they find something new，they love to ask questions and 6 to find out the answers.

    What is the best 7 to get knowledge?If we learn 8 ourselves，we will get the most knowledge.If we are 9 getting answers from others and do not ask why，we will never learn well.When we study in the right way，we will learn more and understand 10.

A 用胶头滴管加水至溶液凹液面正好与瓶颈刻度线相平

B 天平放好后，游码拨到零，调节螺丝，使指针在标尺中间

C 把容量瓶塞好，反复摇匀，然后注入试剂瓶，贴上标签

D 在天平上用烧杯正确称取所需NaOH固体

E 在烧杯中加入适量蒸馏水溶解NaOH

F 直接将蒸馏水缓缓注入容量瓶，直到液面接近刻度线1﹣2cm处

G 冷却到室温，将溶液转移到容量瓶中

H 用蒸馏水洗涤烧杯、玻璃棒2﹣3次，洗涤液注入容量瓶．  回答下列问题：

如图是某种汽车质量测试仪（俗称地磅）的工作原理图，电源电压保持不变，压力传感器的电阻会随着受到的压力的增加而减小，汽车开上踏板，质量显示表的指针就会显示出待测汽车的质量。下列关于测试仪的说法正确的是（      ）