单项选择题

圆的中心线用哪种线型绘制？（）

A.粗实线
B.细实线
C.细虚线
D.细点画线

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单项选择题

秒表时间研究中，重复作业是指具有重复循环型式的作业，重复循环期间持续的时间，（）抽样或观察所需要的时间。 A.
远远小于
B.
大大超过
C.
怡好等于

单项选择题

Smith found a ring on the floor of a super market. As a finder oflost property under the common law, he _______. ()
A、Has the best claim over the ring as against the whole world.
B、Has a better claim over the ring as against the whole world save thetrue owner.
C、Has a better claim over the ring as against the whole world save thetrue owner and the owner of the locusin quo(the super market).
D、Has no claim over the ring but is obligated to turn it in to police.