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- 1两个实心均匀正方体对水平地面的压强相同，它们的密度分别为ρ甲、ρ乙，且ρ甲＞ρ乙.若在两个正方体上方分别施加一个竖直、同方向的力F甲、F乙，且施加的力都小于各自正方体的重力
- 2Jessical fell ill ____a bad cold,that's why she didn't come here today.A in B on C with D during
- 3)用四张大小完全相同的长方形纸片拼成的图形如右图所示.若已知长方形的长为5厘米,宽为2厘米,求图中空白部
- 4已知数列{an}满足：a1=1,a(n+1)=2an+1(n∈N*),用数学归纳法证明：an=2^n-1
- 5While tow men——at the door,tow others went into the house.快,马上要,3Q
- 632x-7x=420-5x解方程怎么做?请列出来好吗?明天就要交了.
- 7英语翻译
- 8he often plays by himself and never takes a walk with his friends是什么意思?
- 9一个正方体木料削成最大的圆锥，圆锥的体积与正方体体积的比是 _ ．
- 10p是抛物线y=2x的平方-8x+8对称轴上的一个动点,直线x=t平行于y轴,分别与直线y=x、抛物线y交于点A、B-----