用计数器测得某放射性物质半小时内发出的脉冲数为390个,该放射性物质每10分钟内平均发出脉冲数的95%可信区间为()
A.A
B.B
C.C
D.D
E.E
参考答案:C
—Mom, may I play computer games just for a while?
—________! Dad is writing his paper.[ ]
A. Help yourself
B. It's up to you
C. Behave yourself
D. Go ahead
婚前医学检查的有关精神病是指()
A、精神分裂症
B、躁狂型精神病
C、其他重型精神病
D、躁狂抑郁型精神病
E、抑郁型精神病