【单选题】在蒸汽冷凝传热中,不凝气体的存在对对流传热系数 a 的影响
【单选题】企业每股盈余最大化目标与利润最大化目标相比,明显的优点是( )。
【单选题】()是企业依据自身的实际-隋况制定企业机构的设置和配备各类人员的数量界限。
【单选题】His heart racing, and tears ____ his eyes, Jack carefully unlocked the box.
【单选题】关于车辆余热利用(停车后利用发动机冷却液制热)最多可持续多长时间
【单选题】在蒸气冷凝传热中,不凝气体的存在对a的影响是( )
【单选题】一般来说,食用菌在生长过程中对温度的需求均呈现()的规律。
【单选题】在蒸气冷凝传热中,不凝性气体的存在会使冷凝传热速率大大降低,这是因为
A.
不凝性气体掺杂在蒸气中,导致蒸气的导热热阻大大增加
B.
不凝性气体掺杂在蒸气中,导致蒸气的对热热阻大大增加
C.
传热壁面附近被不凝性气体遮盖,增加了一层附加的气体导热热阻
D.
传热壁面附近被不凝性气体遮盖,使得冷凝液液膜变厚
【单选题】Ali decides to attend the one hour review session for microeconomics instead of working at his job. His job pays him $10 per hour. Aliʹs opportunity cost of attending the review session is
A.
the $10 he could have earned at his job.
B.
the value of the session minus the $10 he could have earned at his job.
C.
nothing, because the review session does not cost anything.
D.
equal to the benefit he gets from the review session.
E.
the one-hour review session.
【单选题】在蒸气冷凝传热中,不凝气体的存在对 a 的影响是( )