以下设备中,没有灭弧介质的是()
A、油断路器
B、真空断路器
C、高压隔离开关
D、六氟化硫断路器
参考答案:C
I have offered to paint the house ____ a week's accommodation. [ ]
A. in exchange for
B. with regard to
C. by means of
D. in place of
一般来说,森林越多,二氧化碳的交换量越多。