题目内容：
如右图所示，质量为m的等边三棱柱静止在水平放置的斜面上。已知三棱柱与斜面之的动摩擦因数为μ，斜面的倾角为30°，则斜面对三棱柱的支持力与摩擦力的大小分别为（ ）。 
参考答案：
答案解析：
单选题：如右图所示，质量为m的等边三棱柱静止在水平放置的斜面上。已知三棱柱与斜面之的动摩擦因数为μ，斜面的倾角为30°，则斜面对
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