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【简答题】
Complete the following sentences with the words given. Change the form if necessary. complaint contract apologize balance against situation unable deaf request intention He has a four-year _1__ of employment with us. Today he annouced his __2__ to retire. The child was walking along the wall when he lost his _3__ and fell down. There have been a number of _4__ about the standard of service. The trees were black __5_ the evening sky. She has been _6__ since birth. I must __7__ to her for my rudeness. I shall be __8__ to meet you for lunch today. After frequent __9__, he eventually agreed to sing. We are in a different financial __10__.
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【单选题】设测量零件的长度产生的误差X服从正态分布,今随机地测量16个零件,得观测值平方和=34,在置信度0.95下,均值的置信区间为___________ 。(t 0.05 (15)=1.7531,t 0.025 (15)=2.1315)
A.
μ的置信度1-α下的置信区间为(-0.2535,1.2535).
B.
μ的置信度1-α下的置信区间为(0.2535,1.2535).
C.
μ的置信度1-α下的置信区间为(-1.7531, 1.7531 ).
D.
μ的置信度1-α下的置信区间为(- 2.1315 , 2.1315 ).
【简答题】设测量零件的长度产生的误差X服从正态分布,今随机地测量16个零件,得观测值平方和=34,在置信度0.95下,均值的置信区间为___________ 。(t 0.05 (15)=1.7531,t 0.025 (15)=2.1315)
【多选题】演讲开场白的类型及作用,包括以下 。( )
A.
道具式开场白，辅以说明。
B.
引用式开场白，统领题旨。
C.
点题式开场白，开宗明义。
D.
“套近乎”式开场白，结友传情。
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