33. 高頻（HF）電波主要是利用下列何種方式傳播電波？ (A) 直接波 (B) 導波 (C) 地波 (D) 天波

7. If two power driven vessels are crossing in clear visibility so as to be involved in a possible collision, which vessel has to keep out the way of the other vessel? (A) The vessel which has the other on her port side shall keep out of the way. (B) The vessel which has the other on her starboard side shall keep out of the way. (C) Both vessels have an obligation to keep clear of each other. (D) Both vessels should alter course to starboard and avoid passing ahead of the other vessel.

33. 高頻（HF）電波主要是利用下列何種方式傳播電波？
(A) 直接波
(B) 導波
(C) 地波
(D) 天波

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