表征液体质点运动的轨迹线是（）

不透水的铺盖、板桩及底板与地基的接触线，即第一根流线，称为()。

在土石坝的各种排水型式中，()不能降低浸润线。

一般柱中箍筋的加密区位于柱的中间部位。

6、：检查玻璃的角是否方正，以及木骨架的尺寸是否准确，如果有变形现象，应校正后再使用。在校正好的木骨架内侧，固定玻璃板靠位压线条，定出玻璃安装的位置线。（）

PassageoneInarecentstudy,neuroscientistsfoundthatplayingfast-pacedvideogamescouldhelpimprovedyslexic(诵读困难的)children’sreadingspeed,andtheimprovementsdidnotfadewithtime.Researcherstestedthereadingabilityoftwogroupsof10-year-olddyslexicchildrenafteronegrouphadplayedactionvideogamesandtheotherplayednon-actionvideogames.Eachgroupwascomposedof10childrenwhoplayed80minutesofvideogamesadayforninedays,equaling12hoursofplayperchild.Theirreadingskillsweremeasuredonanumberoffactors,includinghowfasttheyreadwordsandhowaccuratelytheyreadthem.Resultsshowedthatimprovementsinreadingspeedachievedfromplayingfast-pacedvideogamescouldevenexceedimprovementsgainedfromayear’sintense,traditionaltherapies.Scientistsaimedtoprovethatthere’sacorrelationbetweenadyslexicchild’svisualattentionspanandtheirabilitytoread.Actionvideogamesaredistinguishedfromnon-actionvideogamesbysuchcharacteristicsasgamespeed,ahighsensory-motorload,andpresentationofmultiple,peripheral(外围的)stimuli.Actionvideogameplayersconstantlyreceivebothexternalandinternalfeedbackontheirperformance,producinglearning.Itturnedoutthattheassumptionsofresearcherswerecorrect.Actionvideogameplayersdefeatedtheirnon-actionpeersinimprovements.Onlyactiongamekidsshowedgeneralreadingimprovements,upto40percent,whilenon-actionreadersshowednoimprovement.Theactiongamersalsoimprovedtheirbasictextreadingbyasmuchas60percent,whilenon-actiongamersshowedamoremodest5percent-10percentgain.Thoughmoreresearchisneededtonaildownthespecificrolethatactiongamesplayintheimprovements,theresearchersclaimedtheirdataisthestart.Theybelievetheirfindingsshowthatattentioncanbestudiedandefficientlytrainedduringinfancy.Thiscanpavethewayforlow-resource-demandingearlypreventionprogramsthatcoulddrasticallyreducetheincidentofreadingdisorders.23.Whichofthefollowingismentionedinthepassageasadifferencebetweenactionvideogamesandnon-actionones?

风管最主要的连接方式是法兰连接。（）

选择水泵的主要依据是流量和扬程。（）

给排水工程识图中的字母“W”可以表示排水管道或污水管道。（）

闸阀的特点是关闭严密，且安装有方向性。（）

水箱中的溢流管上不能安装阀门。（）

安装工程识图中先识读设计及施工说明，而不是先看相关图纸。（）

截止阀的特点是关闭严密，并且安装要注意方向性。（）

直接给水无需借助水箱、水泵。（）

按作用范围的不同，通风系统分为（）