收购人在收购报告书公告后( )日内仍未完成相关股份过户手续的,应当立即做出公告,说明理由。
A.10
B.15
C.20
D.30
参考答案:D
Simon was born in Shanghai he lives in Beijing now. [ ]
A. and
B. but
C. or
D. because
有5个不可修复产品进行寿命试验,它们发生失效的时间分别是1000h、1500h、2000h、2200h、2300h,该产品的MTTF观测值是()。
A.1800h
B.1900h
C.2000h
D.2100h