4、一种细胞的直径为0.00000156米,将0.00000156用科学记数法表示应为( )
A.1.56×106 B.1.56×10-6 C.1.56×10-5 D.1.56×10-4
A.1.56×106 B.1.56×10-6
C.1.56×10-5 D.1.56×10-4
B