水工建筑物按其在枢纽中所起的主要作用，可分为几类？
(1)挡水或壅水建筑物； (2)泄水建筑物； (3)取水建筑物； (4)输水建筑物； （ 5）整治建筑物。
暂无解析
It_______fortwohoursnow
PoorspeakerofEnglishthoughhewasatthetime,hestillmanagedtomakehimself________.
Toaworker,________fromthepointofviewofsocietyisnecessarylaborisfromhisownpointofviewvoluntaryplay.
WehavenoticedtheDutchproducers______ajointventureagreementwithChinesefirms.
ThefollowingisaspecimenofBlackEnglish.“We?ssafe,Huck,we?ssafe!Jumpupandcrackyo?heels,dat?sdegoodoleCairoatlas?,Ijisknowsit!”ThisvarietyofEnglishischaracterizedbythefollowingexceptits______.
