简述火灾中影响逃生自救的四种不利因素。

阅读下面短文，根据所给语境，按要求完成下列各题。

Many of the expressions using water haven’t enjoyable meanings in English.

“Hot water” was used five hundred years ago to mean being in trouble. One story says it got the meaning from throwing hot water down on enemies (敌人) attacking a town. ①That happens no longer, but we still get into hot water.

When we are in hot water, we are in trouble. It can be any kind of trouble, serous or not so serious. A person who breaks a rule can be in hot water with the police. A young boy can be in hot water with his mother if he walks in a house with dirty shoes.

“Water over the dam(水坝)” is another expression about a past event. It’s something that finishes and it cannot be changed. The expression comes from the idea - water has run over a dam and it cannot be brought back again. When a friend is troubled by a mistake he has made, you might tell him to forget about it. You can say “It’s water over the dam.”

“Throwing cold water” means “not to like an idea”. For example, you want to buy a new car because the old one has some problems, but your parents throw cold water on the idea, because they think a new car costs too much.

小题1:阅读短文，并把①处的句子翻译成汉语。

___________________________________________________________________________

小题2:阅读短文，完成下面的句子（每空一词）。

When you say “It’s water over the dam.” to your friend, you want to tell him to __________the __________ he has made.

小题3:用文章中关于“water”的英语短语填空，并使句子通顺。

Your friend invites you to go hiking, but you don’t want to. You can _____________________ on the idea.

回旋加速器主体部分是两个D形金属盒。两金属盒处在垂直于盒底的匀强磁场中，并分别与高频交流电源两极相连接，从而使粒子每次经过两盒间的狭缝时都得到加速，如图所示。在粒子质量不变和D形盒外径R固定的情况下，下列说法正确的是（     ）

A．粒子每次在磁场中偏转的时间随着加速次数的增加而增大

B．粒子在电场中加速时每次获得的能量相同

C．增大高频交流的电压，则可以增大粒子最后偏转出D形盒时的动能

D．将磁感应强度B减小，则可以增大粒子最后偏转出D形盒时的动能

关于纤维结缔组织玻璃样变的发生与下列哪些改变有关（）。

A.胶原蛋白交联增多

B.胶原纤维大量融合

C.胶原纤维间多量糖蛋白蓄积

D.胶原蛋白变性、融合

E.是胶原纤维老化的表现

以下哪些途径可感染艾滋病（）

A.共用食具

B.器官移植

C.吸食母乳

D.人工授精

E.共用刺刀、牙刷，可经破损处传染

在涉案财物价格鉴证中，价格鉴证机构应当在( )内作出扣押、追缴、没收财物价格鉴证结论；另有约定的，在约定期限内作出。

A．自受理之日起7个工作日

B．自委托之日起7个工作日

C．自受理之日起7日

D．自委托之日起7日