Lanczos向量直接叠加法
direct superposition of Lanczos vectors
宝来直接接口
Burroughs direct interface
BDI
传输和用户直接接入
transmission and user direct access
低剂量直接数字化X线成像
Low-dose directly digital radiographic device
非直接接地电网
non solidly grounded network
规范形直接法
normal form direct method