用红外检测仪器测交联聚乙烯无铠装电力电缆表面温度时,允许温升控制在()范围。
A.25K-35K;
B.30K-40K;
C.30K-45K;
D.40K-45K。
参考答案:A
说明可逆反应A(g)+B(g)C(g)+D(g)在一定条件下已达到化学平衡状态的事实是[ ]
A.容器内压强不随时间的变化而变化
B.容器内A、B、C、D四者共存
C.A、D的消耗速率相等
D.C、D的生成速率相等
He______to get a high position in the company, but failed because of his carelessness.[ ]
A. managed
B. suggested
C. attempted
D. considered