单项选择题

Oskar Schindler was named Righteous among the Nations by the _________ government. A.
American B.
Israeli C.
Polish D.
Czech

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多项选择题

饱和和超载的类型可以分为哪3类？ A.
时间上：周期性饱和与超载和偶发性饱和与超载。 B.
时间上：长期连续性饱和与超载和短期性饱和与超载。 C.
空间上：的整体性饱和与超载和局部性饱和与超载。

多项选择题

Which of the following is a consideration when measuring samples in a well counter? （）
A. sample volume should be kept small and consistent among samples

B. samples should be contained in identical tubes

C. amount of radioactivity should be low