【简答题】The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. If the sample is...
【判断题】中心锚结线夹应安装牢固,在直线上应保持铅垂状态,在曲线上应与接触线的倾斜度一致。( )
【简答题】在25℃下将初始压力相同的5.00dm 3 N 2 (g)和15.0dm 3 O 2 (g)充入容积为10.0dm 3 的真空容器中,混合气体的总压为152kPa,则N 2 (g)的分压为______kPa,O 2 (g)的分压为______kPa。25℃时N 2 (g)的初始压力为______kPa。当温度升高至250℃时,保持体积不变,混合气体的总压为______kPa。
【简答题】The table below contains the opinions of a sample of 200 people broken down by gender about the latest congressional plan to eliminate anti-trust exemptions for professional baseball. If the sample is...
【单选题】Milk has an inelastic demand and beef has an elastic demand. Suppose that a mysterious increase in bovine infertility decreases both the population of dairy cows and the population of beef cattle by ...
A.
greater in the milk market than in the beef market.
B.
greater in the beef market than in the milk market.
C.
the same in the milk and beef markets.
D.
may be greater in either the milk market or the beef market.
【多选题】防断式中心锚结线夹的技术状态应符合要求,以下说法正确的是()。
C.
中心锚结线夹在曲线上应与接触线的倾斜度不一致
D.
中心锚结线夹处的接触线高度应与邻点吊弦处导高相等,允许偏差0-10mm
【简答题】在25℃和相同的初始压力下,将5.0LN 2 (g)和15.0LO 2 (g)充入容积为10.0L的真空容器中,混合气体的总压力为152kPa,则N 2 (g)的分压为______kPa;O 2 (g)的分压为______kPa。当温度升至250℃时保持体积不变,混合气体的总压力为______kPa。25℃时N 2 (g)的初始分压为______kPa。
【多选题】主要的人性假设理论有( )假设。[2007、2006年真题]