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[单项选择]

The author mentions "outer space" underlined in Pa

ragraph 1 because ______.

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更多"The author mentions "outer space" underlined in Pa"的相关试题:

[填空题]1mmHg=（）Pa；1atm=（）Pa。
[简答题]一离心风机，测得入口静压力为-300Pa，入口动压为400Pa，出口静压为600Pa，出口动压为500Pa，出口测点处风道截面为1.5m²，风速为20m/s，已知风机轴功率为100KW，求风机效率是多少？
[单项选择]压力的单位是帕（Pa），1Pa表示（）。
A. 1N/m2
B. 1cal/m2
C. 1J/m2
D. 1kg/m2
[单项选择]The outer packing of the black tea in small wooden cases looks （）.
A. attractive
B. attractively
C. beauty
D. beautifully
[多项选择]Which three are true regarding the use of outer joins? （）
A. You cannot use IN operator in a condition that involves an outerjoin.
B. You use (+) on both sides of the WHERE condition to perform an outerjoin.
C. You use (*) on both sides of the WHERE condition to perform an outerjoin.
D. You use an outerjoin to see only the rows that do not meet the join condition.
E. In the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.
F. You cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.
[多项选择]In which two cases would you use an outer join? （）
A. The tables being joined have NOT NULL columns.
B. The tables being joined have only matched data.
C. The columns being joined have NULL values.
D. The tables being joined have only unmatched data.
E. The tables being joined have both matched and unmatched data.
F. Only when the tables have a primary key-foreign key relationship.
[单项选择]In which case would you use a FULL OUTER JOIN?（）
A. Both tables have NULL values.
B. You want all unmatched data from one table.
C. You want all matched data from both tables.
D. You want all unmatched data from both tables.
E. One of the tables has more data than the other.
F. You want all matched and unmatched data from only one table.
[填空题]静压差的判断：洁净室（区）与室外大气≥（）Pa，不同级别之间≥（）Pa。
[单项选择] package foo； public class Outer （ public static class Inner （）） Which statement is true？（）
A. An instance of the Inner class can be constructed with “new Outer.Inner （）”
B. An instance of the inner class cannot be constructed outside of package foo.
C. An instance of the inner class can only be constructed from within the outer class.
D. From within the package bar， an instance of the inner class can be constructed with “new inner（）”
[单项选择]火化中期阶段，由于燃烧趋于稳定，（）呈下降趋势，负压调节到-2Pa~-5Pa为宜。
A. 燃烧器油耗
B. 主燃烧室正压
C. 再燃室正压
D. 污染物的生成
[单项选择]帕斯卡（Pa）属于（）
A. 国际单位制中具有专门名称的导出单位
B. 国际单位制基本*单位
C. 国际单位制辅助单位
D. 国家选定的非国际单位制单位
[单项选择]已知在373K时，液体A的饱和蒸气压为66662Pa，液体B的饱和蒸气压为101325Pa，设A和B构成理想液体混合物，则当A在溶液中的物质的量分数为0.5时，气相中A的物质的量分数应为：（）
A. 0.200
B. 0.300
C. 0.397
D. 0.603
[单项选择]比较牌马柯维茨有效边界上的证券组合PA和资本.市场线上的证券组合PB，相同风险的情况下PA的预期收益率RA与PB的预期收益率RB相比，有（）。
A. RA≥RB
B. RB≥RA
C. RA=RB
D. RA＜RB
[简答题]在300K时，1mol的理想气体由106Pa经过如下两个途径等温膨胀至10⁵Pa：（1）等温可逆膨胀（2）等温自由膨胀试计算这两个过程的ΔU、ΔH、ΔS、ΔA、ΔG。
[判断题]现场气密性检测顺序中先开关门窗5次。再三个脉冲，压差相对值为100Pa，加压速度约为50Pa/分钟，压差稳定作用时间3分钟，泄压时间不少于1分钟
[填空题]氧气和乙炔溶于水中的亨利系数分别为7.2×10⁷Pa·kg·mol-1和1.33×10⁸Pa·kg·mol^-1，由亨利定律可知，在相同条件下，（）在水中的溶解度大于（）在水中的溶解度。
[填空题]400K时，液体A的蒸气压为4×10₄Pa，液体B的蒸气压为6×10₄Pa。二者组成理想溶液。当达到气—平衡时，在溶液中A的摩尔分数为0.6，则在气相中B的摩尔分数为（）。
[简答题]某真空浓缩器上真空表的读数为15.5×10³Pa，设备安装地的大气压强为90.8×10³Pa，试求真空浓缩器内的绝对压强。

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