How many _____ medicine are used for the

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问题选择题

How many _____ medicine are used for the children of six years old?

A. kind of
B. kinds of
C. kind
D. kinds

答案

答案：B

解答题

自变量x为何值时，函数y₁=x、y₂=x-10和y₃=40-2x图象上的点都在x轴上方．

判断题

麻疹的临床表现分为前驱期、出疹期和恢复期。