This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates...This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates, we obtain some sufficient conditions which ensure the energy admits exponent decay.展开更多
【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介...【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介词和关系代词不能省。二、介词本身就是定语从句中短语动词固定搭配的一部分,这时介词既可放在关系代词前。展开更多
This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we...This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we obthain some sufficient conditions which ensure the energy admits exponent decay.展开更多
MET(93)第11小题主要是考查感叹句的用法。另外,该题还考查了语序问题。该题是: __from Beijing to London. A. How long way it is B.What a long way is it C.How long way is it D.What a long way it is 此题正确答案应选D。有的考...MET(93)第11小题主要是考查感叹句的用法。另外,该题还考查了语序问题。该题是: __from Beijing to London. A. How long way it is B.What a long way is it C.How long way is it D.What a long way it is 此题正确答案应选D。有的考生误选了A、C。究其原因,是这些考生只知道how应该修饰形容词或副词,由于形容词long紧接在how之后,他们就想当然地误选成了A或C。也有的考生误选了B。一是他们没注意句末的感叹号,紧张之中误把该句看成了疑问句,二是没弄清感叹句的的语序。要选准此题答案,还得从感叹句的概念和结构谈起。展开更多
文摘This paper deals with the initial boundary value problems for the semilinear wave equations with variable coefficient principal part. By virtue of compactness uniqueness argument as well as the usual energy estimates, we obtain some sufficient conditions which ensure the energy admits exponent decay.
文摘【简析】“介词+关系代词”结构中,介词的选择常常令同学们头疼。从以上练习我们可以看出,要正确选用介词,必须弄明白以下内容:一、“介词+关系代词”结构中,关系代词只能用 which(指物)或 whom(指人),不能用 that 或 them 等词,而且介词和关系代词不能省。二、介词本身就是定语从句中短语动词固定搭配的一部分,这时介词既可放在关系代词前。
文摘This paper deals with the initial boundary value problems for the nonlinear wave equations with varable coefficient principal part.By virtue of compactness uniqueness argument as well as the usual ener-gy estimates,we obthain some sufficient conditions which ensure the energy admits exponent decay.
文摘MET(93)第11小题主要是考查感叹句的用法。另外,该题还考查了语序问题。该题是: __from Beijing to London. A. How long way it is B.What a long way is it C.How long way is it D.What a long way it is 此题正确答案应选D。有的考生误选了A、C。究其原因,是这些考生只知道how应该修饰形容词或副词,由于形容词long紧接在how之后,他们就想当然地误选成了A或C。也有的考生误选了B。一是他们没注意句末的感叹号,紧张之中误把该句看成了疑问句,二是没弄清感叹句的的语序。要选准此题答案,还得从感叹句的概念和结构谈起。
