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建筑材料是建筑工程的物质基础。()

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烧结多孔砖和烧结空心砖在运输、装卸过程中，应避免碰撞，严禁倾卸和抛掷。()

？You will hear five short recordings.
？For each recording, decide how much the speaker should pay.
？Write one letter (A--H) next to the number of the recording.
？Do not use any letter more than once.
？You will hear the five recordings twice.
A 51 pounds
B 17 pounds
C 2.16pounds
D 1.85 pounds
E 16 pounds
F 1.35 pounds
G 2.42 pounds
H 1.45 pounds

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烧结砖又称蒸压砖。()