交叉法穿大绳，滚筒钢丝绳（）。A、不易缠乱 B、易缠乱 C、易打扭 D、不易打扭

内含子通常可以在相关基因的同一位置发现。 ( )

小题1:The cup fell off the table and got b____________.

小题2:If you want to keep h_____________, you need to eat less and take more exercise.

小题3:S______________ is the ninth month of the year.

小题4:I don’t like those shoes; b_____________, they’re too expensive.

小题5:A bridge a_______________ the river is going to be built next month.

小题6:The traffic during the rush hour is much ____________ (忙碌) than usual.

小题7: You can find the book you want on those book ____________ (书架) .

小题8:Nowadays prices of houses in big cities are still r______________ (上升）though measures have been taken.

小题9: I often find it difficult in making myself ________________ （明白）.

小题10:“I just _____________ (完成) making my last movie last week,” said the famous movie star.

我国规定：水质必须在感官性指标、化学指标、病理学指标等方而达标方可成为生活饮用水．各种指标的主要要求有：①不得呈现异色；②不得有异味；③应澄清透明；①不得含有细菌和病毒．

（1）前两个指标可以利用______（填物质名称）的吸附作用而达到．

（2）自来水厂生产自来水的过程如图1所示

由图可知净化水时，③④两个指标可通过______（填字母）过程而达到．

（3）水的硬度是一项重要的化学指标．日常生活中将硬水进行软化处理的方法是______．

（4）如图2是市场上出售的一种活性炭净水器示意图．这种净水器入水口在下方的优点是______．

已知：

3/2CO₂(g)＋2Fe(s) = Fe₂O₃(s)＋3/2C(s) △H=-234.1kJ·mol^-1

CO₂(g) = C(s)＋O₂(g) △H=+393.4kJ·mol^-1

则2Fe(s)＋3/2O₂(g)=Fe₂O₃(s)的△H是[ ]

A．-824.2kJ·mol^-1

B．-627.5kJ·mol^-1

C．+861.6kJ·mol^-1

D．+159.3kJ·mol^-1

《中国民用航空通信导航监视系统运行、维护规程》第二十二条规定，无线通信设备完好率必须达到90%。