在315kVA以下的变压器低压侧计费的电力用户能量计量点应采用()的无功电度表。
A．1.5级
B．2.0级
C．2.5级
D．3.0级
参考答案：D
把一个64cmx40cmx24cm的长方体切成若干个完全相同的小正方体，并使这些小正方体的表面积总和最小，则小正方体的表面积总和为( )。
A．73280cm2
B．54680cm2
C．69450cm2
D．46080cm2
I am very thankful to my English teacher, I have made great progress. [ ]
A. by whose help
B. with whose help
C. with his help
D. by his help
