The man has a black hat ( )his head.括号里用什么介词

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• The man has a black hat ( )his head.括号里用什么介词
• The man has a black hat ( )his head.括号里用什么介词
• his head soon appeared out of the windows,___he could see nothing but trees
• 设m为实数，函数f（x）=2x2+（x-m）|x-m|，h(x)＝f(x)x(x≠0)0(x＝0)．（1）若f（1）≥4，求m的取值范围；（2）当m>0时，求证h（x）在[m，+∞）上是单调递增函数；（3）若h（x）对于一切x∈[1，2]，