前导图法的开始开始关系
PDM Start to Start Relationship
测试驱动开发
test driven develop
Keywordtest driven development
Test-driven development
TDD
test drive development
大电流驱动开关集成电路
High current-drive switch IC
过冷水珠冻结开始时间
freezing transition time of super cooled water drop
积雪开始时间
snow beginning time
starting date of snow cover