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问题
填空题
单项式-4πxy
2
的系数是______．
答案
根据单项式系数的定义，单项式-4πxy
2
的系数是-4π．
故答案为：-4π．
选择题
Mark often attempts to escape _______ whenever he breaks traffic regulations.
A. having been fined
B. being fined
C. to have been fined
D. to be fined
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问答题 简答题
什么是颗粒的长宽比？
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