【判断题】定额人工费指直接从事建筑安装工程施工的生产工人开支的各项费用。()
【多选题】i'd like to check in.
A.
do you have a reservation?
B.
sorry, we have no room available.
C.
well. what kind of would you like?
【多选题】2008 年北京奥运会的“三大理念”包括______________。
【单选题】How many pounds of heroin were estimated to be smuggledinto the United States in 1994?
【单选题】I'd like to check in .
【简答题】管内湍流传热,流体内温度梯度最大的部分是在______,原因是_____________________________________。 2.管内对流传热,短管的对流传热系数比长管______,因为________。