RH处理用脱硫剂的有效成份是()。
A.CaO
B.CaF2
C.CaO+CaF2
参考答案:A
连词成句。
1. than his him father heavier is (.)
2. she more than mine apples ten has (.)
3. can she the deep dive cold water into (.)
4. feet are his shorter (.)
5. old your good how is friend (?)
A.变压器输出端所接电压表的示数为20V
B.变压器的输出功率为200W
C.变压器输出端的交流电的频率为50Hz
D.穿过变压器铁芯的磁通量变化率的最大值为20/n2Wb/s