手提式应急无线电设备平时应保存在:
B
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Sorrysir,wedon'thavewineorbeer.Weareonlylicensedtosell_______drinks.
Theproblem________whenthestudentsrefusedtodotheirhomework.
________(catch)intherain,hewaswettotheskin.
求曲线y=x^2与直线y=0,x=1所围成的平面图形绕x轴旋转一周所得旋转体的体积V.
则下列结论正确的是()