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【单选题】
生铁、熟铁、钢的主要化学成分均为 Fe ,但他们之间的性能差别显著,主要原因是其中( )不同A.
珠光体含量
B.
硬度
C.
含碳量
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反馈参考答案：
举一反三
【单选题】Is the flight a direct flight?
A.
Yes
B.
No, it has a stopover.
C.
It is not mentioned.
【单选题】From larger stations that are not served by direct freight flight, the freight may be carried by ( ) that connect with a freight flight
A.
charter flight
B.
airport facility
C.
passenger flight
D.
any flight
【单选题】Why does the woman have to change her flight in Madrid?
A.
There's no direct flight.
B.
There's no seat available on direct flight.
C.
She wants to leave tomorrow morning.
D.
She will contact some people at Madrid.
【单选题】The key word in Paragraph 4 is ______.
A.
disability
B.
ignorance
C.
prejudice
D.
barriers
【单选题】下列关于细胞膜的叙述，不正确的是 [ ]
A.
细胞膜主要由脂质和蛋白质组成
B.
不同功能的细胞，其细胞膜上蛋白质的种类和数量相同
C.
组成细胞膜的脂质中，磷脂最丰富
D.
癌细胞的恶性增殖和转移与癌细胞膜成分的改变有关
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