2.國際海事衛星（INMARSAT）-B型，其行動號碼（IMN）共有幾個碼？ (A)6 (B)7 (C)8 (D)9

11.For Typhoon and the cyclone, which statement of the following is incorrect? (A)Normally, the affected area of Typhoon is smaller than the cyclone. (B)The cyclone exists in higher latitude than Typhoon. (C)Typhoon may develop at high latitude subject to the surface of seawater is cold enough. (D)Typhoon has no front but the cyclone has warm or cold front.