1. The midgut gland cell differentiation occurs at Z2. There are 4 types of cells, i. e. , embryonic cell (E-cell), fibrillar cell (F-cell), blister cell (B-cell) and resorptive cell(R-cell).
中肠腺小管上皮在Z2期细胞已有了分化，由4类细胞组成，即胚细胞（E细胞）、纤维细胞（F细胞）、泡状细胞（B细胞）和吸收细胞（R细胞）。
2. Electric Power Meter:AC Electric Power Meter, Electronic Type Electric Power Meter, Timeslicing Calculate Electric Power Meter, Demand Maximum Electric Power Meter, DC Electric Power Meter;
电能表：交流电能表、电子式电能表、分时计度（多费率）电能表、最大需量电能表、直流电能表；
3. Electric Power Meter:AC Electric Power Meter, Electronic Type Electric Power Meter, Timeslicing Calculate Electric Power Meter, Demand Maximum Electric Power Meter, DC Electric Power Meter;
电能表：交流电能表、电子式电能表、分时计度（多费率）电能表、最大需量电能表、直流电能表；
4. Electric Power Meter:AC Electric Power Meter, Electronic Type Electric Power Meter, Timeslicing Calculate Electric Power Meter, Demand Maximum Electric Power Meter, DC Electric Power Meter;
电能表：交流电能表、电子式电能表、分时计度（多费率）电能表、最大需量电能表、直流电能表；
5. Electric Power Meter:AC Electric Power Meter, Electronic Type Electric Power Meter, Timeslicing Calculate Electric Power Meter, Demand Maximum Electric Power Meter, DC Electric Power Meter;
电能表：交流电能表、电子式电能表、分时计度（多费率）电能表、最大需量电能表、直流电能表；
