蜡油加氢裂化装置离心式压缩机在正常运行时压缩机各轴承轴瓦温度应不大于（）℃。
A、60
B、80
C、110
D、150
参考答案：C
The employees were asked to concentrate their attention________improving the quality of the products.[ ]
A. in
B. to
C. with
D. on
高频阻波器出厂验收，对单频高频阻波器，阻塞阻抗应大于1000Ω对宽频高频阻波器，阻塞阻抗应大于（），阻塞电阻分量大于570Ω。
A.1000Ω
B.800Ω
C.700Ω
D.600Ω
