chargen.责任；电荷；指控；费用；照顾vi.要价；充电；向前冲，冲锋；记在账上vt.控诉；赊帐；给…充电；委以重任；归罪于；装填（炸药等）charge book作业记录

1. Electrode experiment equipment was developed,and electrostatic spraying charge-mass ratio measurer was developed.
   开发了电极试验装置，并自制了荷质比测试装置。
2. Because the proteins have the same charge-to-mass ratio, and because the gels have sieving properties, mobility becomes a function of molecular weight.
   重要的是，这些负电荷中和了蛋白分子的内在电荷，使所有的蛋白质具有了相同的荷质比，在凝胶的分子筛作用下，迁移速率就变成与分子量相关。