电动给水泵轴承温度升高的原因()。
A、润滑油温高;
B、泵组出力大;
C、润滑油压低、油箱油位低;
D、密封水泄漏。
参考答案:A, B, C, D
Eighty-two people were reported______in the plane crash.
A.to have injured
B.to have been injured
C.injured
D.injuring
采购市场调查在企业经营管理中的作用有哪些?