用于检查汽车电子控制系统元件的数字万用表阻抗必须大于（）
A.10KΩ
B.20KΩ
C.10MΩ
D.20MΩ
参考答案：C
—It is so dark tonight, Mum.
— Yes, this is just ________ we can enjoy brilliant stars in the sky.[ ]
A. when
B. where
C. how
D. because
水文循环与地质循环的区别？
