设因果稳定的LTI系统的单位抽样响应h(n),在n<0时,h(n)=()
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按照等强匹配原则,下列适宜焊接Q235A钢板的有()
A. J422
B. J427
C. H08A+HJ431
D. H10Mn2+HJ431
依据华电《电力安全工作规程》(热力和机械部分)(试行),禁止在氢气系统或设备上进行动火作业或做产生火花的工作。在氢气系统设备附近动火作业,应按规定办理()
A. 热机工作票
B. 动火工作票
C. 操作票
D. 申请汇报
In all cases,however,the capacity of segregated ballast tanks shall be()such that,in any ballast condition at any part of the voyage,including the conditions consisting of lightweight plus segregated ballast only,the ship’s draughts and trim can meet the necessary requirements.
A. at least
B. at most
C. so big as
D. as large a
某商业企业(一般纳税人)2009年4月向消费者个人销售金银首饰取得收入58950元,销售金银镶嵌首饰取得收入35780元,销售镀金首饰取得收入32898元,销售镀金镶嵌首饰取得收入12378元,取得修理清洗收入780元。该企业上述业务应纳消费税为()元。(金银首饰消费税率为5%)