Mains voltage is sufficiently stable for the reactive power and within the range of_______________.
A: no more than 360 VA C
B: at least 440 VAC
C: etween 360 VAC and 440 VAC
D: oth A and B
A: no more than 360 VA C
B: at least 440 VAC
C: etween 360 VAC and 440 VAC
D: oth A and B
举一反三
- Mains voltage is sufficiently stable for the reactive power and within the range of_______________.
- VAC能发生聚合反应是因为() A: VAC有双键 B: VAC双键的不稳定性 C: 甲醇的稳定性 D: 甲醇的不稳定性
- 如果VAC一车间精馏工序操作不当,进料VAC带TDA,会影响() A: VAC活性 B: 聚合率低 C: 聚合率高 D: 副反应增加
- VAC防聚合操作中,人工启动循环系统,在冷冻系统运行的情况下,对VAC物料进行降温,VAC的回料温度为26℃。
- 精VAC塔TQ203馏出VAC质量合格的有() A: 醋酸0.0001-0.003% B: 活度450-570S C: 乙醛0.001-0.1% D: 水0.001-0.02%