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A．The scientists know it is definitely getting smaller.B．The scientists know it is near

A. The scientists know it is definitely getting smaller.
B. The scientists know it is near extinct.
C. The scientists still do not know.
D. The scientists think it is rebounding slightly.

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下列各项中叙述有误的是()。

A. 通过应用关键路径法对网络图进行分析和运算,可为管理工作指明方向,为项目经理提供决策依据,从而保证项目在预算范围内如期完成
B. 在PERT系统中,如果方差很大,则表明完成该工作时存在的不确定因素较多。方差的大小表明了人们对完成工作信心的强弱程度
C. 方差和标准差主要用于对比,它表明时间估计的可靠程度
D. 各工作完成时间的独立程度越高,方差的近似程度越差

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A．All whaling is bad.B．Commercial whaling is immoral.C．Whaling should be limited only f

All whaling is bad.
B. Commercial whaling is immoral.
C. Whaling should be limited only for food.
D. The IWC should be replaced.

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设随机变量X的密度函数为φ(x)，且φ(－x)＝φ(x)，F(x)为X的分布函数，则对任意实数a，有()．

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用关键路径法管理项目进度时,()决定着项目的工期。

A. 时间最长的路线
B. 时间最短的路线
C. 时间较长的路线
D. 时间较短的路线

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A．The scientists know it is definitely getting smaller.B．The scientists know it is near

A. The scientists know it is definitely getting smaller. B. The scientists know it is near extinct. C. The scientists still do not know. D. The scientists think it is rebounding slightly.

下列各项中叙述有误的是()。

A．All whaling is bad.B．Commercial whaling is immoral.C．Whaling should be limited only f

设随机变量X的密度函数为φ(x)，且φ(－x)＝φ(x)，F(x)为X的分布函数，则对任意实数a，有()．

用关键路径法管理项目进度时,()决定着项目的工期。

A. The scientists know it is definitely getting smaller.
B. The scientists know it is near extinct.
C. The scientists still do not know.
D. The scientists think it is rebounding slightly.