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【单选题】
配制为4份0.9%氯化钠、3份10%葡萄糖、2份1.4%碳酸氢钠的溶液张力是
A.
1/5张
B.
1/4张
C.
1/3
D.
1/2张
E.
2/3张
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【简答题】The first tennis balls ______ (是由皮革里面塞满羊毛或是毛发制成的).
【单选题】Which of the following would not cause an increase in demand for tennis balls?
A.
a reduction in the price of tennis racquets
B.
a decrease in the price of tennis balls
C.
an unusually sunny fall and winter
D.
an increase in the popularity of tennis
【简答题】阅读理解。 Life is like throwing and catching four balls of life in the air.You call the balls work,family,friends and minds.You will soon understand that work is a  rubber ball.If  you  drop it,it will bo...
【单选题】Mary has ten _____. [     ]
A.
tennis
B.
tennis rackets
C.
baseball
D.
collection
【单选题】The boiler feed pump discharge pressure is higher than the steam drum pressure to _____.
A.
ensure feed water flow into the boiler
B.
keep the steam drum pressure high
C.
prevent water hammer in the feed line
D.
help the feed water flash to steam
【单选题】是函数 的( )间断点.
A.
可去;
B.
跳跃;
C.
无穷;
D.
震荡.
【简答题】If the supply of tennis balls, a complement to tennis racquets, decreases, what will happen to the equilibrium price of tennis balls and to the equilibrium price of tennis racquets?
【单选题】Tigers  ____ meat-eating animals  ____ meats. [     ]
A.
belonged to; feed on
B.
belonging to; feed on
C.
were belonged to; are fed on
D.
belonging to; are fed on
【单选题】T细胞分化成熟场所是( )
A.
骨髓
B.
胸腺
C.
黏膜相关淋巴组织
D.
E.
淋巴结
【单选题】What does the author mean by saying 'you are throwing part of a tree' (line 2, para 2)?
A.
We are tired of the part of a tree.
B.
We are throwing away paper bags.
C.
We are using too much wrapper paper.
D.
We are wasting our precious materials.
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