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【多选题】
下列哪些是影响放射性核素有效半衰期的因素 ( )A.
物理半衰期
B.
核的衰变方式
C.
射线的能量
D.
生物半衰期
E.
放射性核素的初始活度
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皮皮学刷刷变学霸
举一反三
【判断题】In the sentence: “ There are three steps to put an elephant in a fridge.” “three steps ” is the controlling idea.
A.
正确
B.
错误
【单选题】Three steps before the meeting in order to plan and participate in productive meetings are to___________.
A.
consider alternatives, invite the right people, distribute an agenda
B.
consider alternatives, invite the right people, writing
C.
consider alternatives, distribute an agenda, revise
D.
invite the right people, distribute an agenda ,proofreading
【单选题】If you want to make a complete mummy tomb, there should be three main steps.
A.
Y
B.
N
C.
NG
【简答题】职业卫生调查设计中，调查研究各个环节中最核心的问题是（ ）。
【多选题】Manufacturing encompasses three steps
A.
the design of the product
B.
the selection of raw materials
C.
the sequence of processes through which the product will be manufactured
D.
the manufacture technology
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