degree of operating leverage
zero capital of operating
128-bit operating systems
16-bit operating system
1st grade clean operating room
32-bit operating systems
64-Bit Operating Systems
abdominal operating instruments set
abnormal operating cash flow
abnormal operating condition
Abnormal Operating State
abnormal operating transient
accident operating condition
accident operating conditions
accident operating rules
accidental operating conditions
accumulated operating time
accuracy of operating data
actual operating ability