单项选择题
(A)7t (B)6t (C)5t (D)4t
(A)55mm (B)65mm (C)70mm (D)75mm
(A)50s (B)40s (C)30s (D)20s
(A)12L/S (B)22L/S (C)32L/S (D)42L/S
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