$9.4^{10} 5^{25}$ 的位数（用十进位制）是 (A) 31: (B) 30; (C) 29; (D) 28; (E) 27.

The number of digits (in decimal notation) of $9.4^{10} 5^{25}$ is (A) 31: (B) 30; (C) 29; (D) 28; (E) 27.
D

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