A.>3% B.2%~3% C.1%~2% D.<1%
A.≤0.8 B.≤0.7 C.≤0.6 D.≤0.5
A.420≤Ur≤468 B.90≤Ur≤468 C.50≤Ur≤108 D.60≤Ur≤207