A:0
B:1
C:-2
D:-1
How would you like if you were watching your favorite TV program and someone came into the room and just shut it off without asking you?
如图,为测量一座山峰CF的高度,将此山的某侧山坡划分为AB和BC两段,每一段山坡近似是“直”的,测得坡长AB=800米,BC=200米,坡角∠BAF=30°,∠CBE=45°.
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辅____(bǔ fǔ)导 屏____(pín píng)幕 恋恋____(liàn làn)不舍