如图所示用50n的水平压力将一重20n的木块压在竖直的墙壁上当木块沿竖直方�匀速下�时木块受到的�擦力的大小是 A.20nb Template




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tomski如图所示用50n的水平压力将一重20n的木块压在竖直的墙壁上当木块沿竖直方�匀速下�时木块受到的�擦力的大小是 a.20nb coloring