某土坡高差5.2m，采用浆砌块石重力式挡土墙支挡，如下图所示。墙底水平，墙背竖直光滑；墙后填土采用粉砂，土对挡土墙墙背的摩擦角δ=0；不考虑地面超载的作用。
粉砂的重度γ=20kN／m3，内摩擦角φ=32°，黏聚力c=0。试问，其主动土压力系数最接近于下列何项数值？（）提示：当墙背垂直，光滑，填土表面水平且与墙齐高时，主动土压力。
A.0.450
B.0.554
C.0.307
D.1.121
参考答案：C
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| An old lady went out 1 last Sunday. She came to a bank and saw a car near the door. a man got 2 it and went into the bank. She looked into the car, the keys were in the lock. The old lady took the keys and 3 the man to the bank. The man took a gun 4 his pockets, and said to the officers, "Give me 5 money!" But the old lady didn't see this, she went to the man and 6 the keys in his hands and said, "Young man, you are foolish. Never 7 your keys in your car. Someone's going to steal it." The man looked at the old woman for a few seconds. The he took 8 and 9 the bank, got into his car and drove away 10 money. | ||||
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