A.勞動(dòng)作業(yè)環(huán)境 B.自然環(huán)境 C.管理環(huán)境 D.市場(chǎng)環(huán)境
A.10% B.15% C.12% D.20%
A.≤40%、≤50% B.≤50%、≤60% C.≤50%、≤70% D.≤40%、≤60%