【单项选择题】
A number of bags are worn-out()a certain extent.
A、A.at
B、B.in
C、C.on
D、D.to
A、A.at
B、B.in
C、C.on
D、D.to
A、bandwidth B、number of plug-ins per scan C、total number of network devices D、number of checks in each posture assessment
A、bandwidth B、number of plug-ins per scan C、total number of network devices D、number of checks in each posture assessment