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问题 判断题

朗肯土压力理论的基本假设是：墙背直立、粗糙且墙后填土面水平。( )

答案

参考答案：错

填空题

80比100少______%
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单项选择题

Even though the main source of______exposure for a majority of the human population is the sun, the artificial tanning from sun beds contributes significantly to the total UV risk.

A．extra violent

B．extra violet

C．ultraviolet

D．ultravirus
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