9. 翻譯：過去 2 小時的氣壓計變化為 30 毫巴。
(A). Hexametric change is 30 millibars within the last 2 hours.
(B).Barometric change is 30 millibars within the last 2 hours.
(C).Chronometric change is 30 millibars within the last 2 hours.
(D). Thermometric change is 30 millibars within the last 2 hours.

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統計： A(2), B(22), C(2), D(6), E(0) #1255000