【多选题】下列关于糖酵解生理意义描述正确的是( )。
C.
糖酵解最终产物丙酮酸可通过各种代谢途径生成不同物质
F.
该途径多数反应均可逆转,为糖异生作用提供了基本途径
【单选题】实腹式悬链线无铰拱拱轴线的确定一般采用无矩法,即认为主拱圈截面仅承受( )而无( )
【判断题】Vent Pipe: a pipe to provide flow of air to provide air circulation to protect water seal of traps against Siphonage and backflow
【单选题】How does the vent pipe system work?
A.
It takes air from the outside.
B.
It pulls radon from beneath the house and vents it to the outside.
C.
It mixes radon with water.
D.
It uses the electric fan to ventilate the house.
【单选题】衣服面料所含有的什么成分可能对人体健康产生较严重的影响?( )
【单选题】Pressure Cooker (压力锅) Safety When you arecooking with a pressure cooker, you should learn a few common sense (常识) rules: 1. Neverleave the cooker unwatched when it is in use. 2. Add sufficientliquid b...
A.
as soon as the cooking is finished
B.
while it is still on the stove
C.
with force when it is hot
D.
after it is cooled down
【判断题】将总体系列不同的综合指标排列起来就构成时间数列。()
【单选题】现代铸造生产中,用砂型所生产的铸件,占总产量的( )以上。