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【简答题】
膜分离是利用膜的选择性 ,以膜的两侧存在的能量差作为推动力,由于溶液中各组分透过膜的 不同而实现分离的一种技术。
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举一反三
【简答题】根据现场测定数据,当地大气压为100kPa,求设备两点处的绝对压强差(p 1 - p 2 ),以Pa表示 : (1)p 1 =10kgf/m 2 (表压),p 2 =7kgf/m 2 (表压) ; (2)p 1 =600mmHg (表 压 ),p 2 =300mmHg(真空) ; (3)p 1 =6kgf/m 2 (表压),p 2 =735.6mmH g(真 空 )。
【简答题】Dear Laura, Hi! I am Veronica, your new pen friend from Singapore. I got your name and address from the Pen Pals' Column in Buddies magazine and thought I'd write to you. Well, let me start by ...
【单选题】A: Can I borrow your geography notes from Professor Johnson's class? B: ______.
A.
I beg your pardon. But why don't you ask Betty for it?
B.
What do you need it for? You can have it anytime you like.
C.
Sure. I need it too. Here you are.
D.
Sorry, I am using it myself. You can have it later.
【简答题】1-7 根据现场测定数据,求设备两点处的绝对压力差(P1-P2) ,以kPa表示:( 1 )P1=10 kg f /cm 2 (表压 ) ,P2=7 kg f /cm 2 (表压 ) ;( 2 )P1= 600mmHg(表压 ) ,P2= 300 mmHg(真空度);(3)P1= 6kg f /cm 2 (表压 ) ,P2= 735.6 mmHg(真空度)
【单选题】一外径为内径两倍(D=2d)的空心圆轴．受扭时最大切应力与直径d 0 的实心圆轴最大切应力相同，则空心圆截面的面积必为实心圆截面积的______。
A.
78.2%
B.
21.8%
C.
121.8%
D.
50%
【单选题】听力原文： This is Margaret from General Public Services. I got your number from one of your customers, City Chiropractic. I would like to place an order for a water dispenser service. We would like to ren...
A.
The chiropractic office.
B.
The accountant.
C.
The manager.
D.
A new customer.
【简答题】会计主体前提为会计核算确定了空间范围，会计分期前提为会计核算确定了时间范围。（ ）
【单选题】--- Rose, I'm making your favorite chocolate cake. --- Thanks, Mom. I know it from the ______ from the kitchen.
A.
taste
B.
care
C.
space
D.
smell
【简答题】会计主体前提为会计核算确定了空间范围，会计分期前提为会计核算确定了时间范围。( )
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