单项选择题

水在（）℃时密度最大。
A、0
B、2
C、4
D、-4

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单项选择题

Which sentence about compass is right?
A、Ancient compass was made of magnetic.
B、Compasses were first used in navigation during 4th century B.C.
C、In Song dynasty, people used compasses in Fengshui.
D、Western countries used compasses to give directions in wars.

单项选择题

( )是绩效考核中比较简单易行的一种综合比较方法。 A.
排列法 B.
比较法 C.
分布法 D.
对比法