30. 摩斯碼 I(．．)與 T(－)之間的長度是多少個時間單位？ (A) 1 (B) 3 (C) 5 (D) 7

8. By SMCP, choose one of the following sentences for expressing ”Fire has been located in no.1 hold. The cargo is on fire； smoke is not poisonous.” (A) “Fire is in number 1 hold； cargo on fire； smoke not toxic.” (B) “Number 1 hold and cargo burning； smoke not toxic.” (C) “Fire is in number 1 hold； cargo on fire； smoke not harmful.” (D) “Number 1 hold on fire； cargo is burning； smoke not poisonous.”

30. 摩斯碼 I(．．)與 T(－)之間的長度是多少個時間單位？
(A) 1
(B) 3
(C) 5
(D) 7

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