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單項(xiàng)選擇題

Which of the following is the standard aspect ratio for HDTV？（）

A.2.35：1
B.4：3
C.1.33：1
D.1.78：1

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單項(xiàng)選擇題

Which of the following would be the impedance of an 8 ohm and a 4 ohm speaker that are wired in parallel？（）

A.2.66 ohms
B.Less than 1 ohm
C.4 ohms
D.12 ohms

單項(xiàng)選擇題

Which of the following can cause ghosting in a video image？（）

A.Bent pin on an S-Video cable
B.Mislabeled component cables
C.Defective HDMI cable
D.Improperly terminated coax cable