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在UNIX标准上有两大阵营:一个是【】,以AT&T与Sun公司为首;另一个是开放系统基金会(OSF),以IBM、
在UNIX标准上有两大阵营:一个是【 】,以AT&T与Sun公司为首;另一个是开放系统基金会(OSF),以IBM、HP、DEC为首。
在UNIX标准上有两大阵营:一个是【 】,以AT&T与Sun公司为首;另一个是开放系统基金会(OSF),以IBM、HP、DEC为首。
设A,B为随机变量,我么构造随机过程,其中A,B具有零均值以及相同的方差
,且不相关,则X(t)的均方值为
A、0
B、1
C、
D、
A、We have contacted the shipping company and regret to tell you that we are unable to ship the goods before April
B、Owing to the unforeseen difficulties on the part of our manufacturers, we regret being unable to ship the goods with the time limit of your credit
C、We regret that these goods are not available at present
D、Please accept my apology for the delay which has been caused by the unavailability of shipping space from Guangzhou to London
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