以下省份中黄河、长江都流经的是()。
A.甘肃
B.四川
C.陕西
D.河南
参考答案:B
________ with what he said, what he did was more valuable.
A.Comparing
B.Compare
C.To compare
D.Compared
导前微分信号的双回路汽温调节系统方框图。