电力系统中确定补偿容量的一般方法有()。
A.从提高功率因数需要确定
B.从降低线损需要确定
C.从提高运行电压需要确定
D.从提高视在功率需要确定
参考答案:A, B, C
He _____ articles for our wall-newspaper these three years, and he _____ about forty articles.
A.has been writing; has written
B.has been writing; wrote
C.is writing; has been writing
D.has written; has written
土生万物