下列报表中，属于我国现行企业会计制度规定企业编制的会计报表附表的有（）。 A.资产减

小题1:Children need time to do things by t_______(他们自己)

小题2: Rodert and his friends walked home together in  s________(沉默)

小题3: Could you pass on the  m________(消息) to Alice?

小题4:Marcia wants to have a s _________(惊讶) party for her mom.

小题5: How  l_________(幸运的) you are!

左侧三房心描述正确的是

A．左房内异常回声将心房分为真房与副房
B．肺静脉血流首先进入真房
C．真房血流进入副房
D．超声见全心普遍扩大
E．真房与肺静脉相连

.电焊工在工作时，都要戴上防护面罩，是因为电焊的弧光中有强烈的_______，它能灼伤人的眼睛.

风机振动的原因一般有哪些？

Financial derivatives contribute to market completeness by allowing traders to do all of the following EXCEPT :()

A. increase market efficiency through the use of arbitrage. 

B. narrow the amount of trading opportunities to a more manageable range. 

C. engage in high risk speculation.