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【单选题】
在中性粒细胞间接趋化作用的物质中,可裂解C3为C3a、C3b的物质是A.
抗原抗体复合物
B.
组织蛋白酶
C.
病毒感染细胞
D.
溶酶体的蛋白酶
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反馈参考答案：
举一反三
【判断题】However, by learning to get copper and tin by heating rocks and combining copper and tin to make an alloy called bronze, the technology of metallurgy began about 3500 B.C. with the Bronze Age. 这句话的意思是...
A.
正确
B.
错误
【判断题】Much effort has been placed on understanding the iron-carbon alloy system, which includes steels and cast irons.这句话的意思是人们很重视研究铜铁合金系，包括铜和铸铁。
A.
正确
B.
错误
【简答题】alloy的意思是( )
【判断题】Much effort has been placed on understanding the iron-carbon alloy system, which includes steels and cast irons.这句话的意思是 人们很重视研究铜铁合金系,包括铜和铸铁。
A.
正确
B.
错误
【简答题】A．血轮 B．风轮 C．气轮 D．水轮 E．肉轮 黑珠属肝称
【单选题】If the yen per dollar exchange rate is 200 yen, then it falls to 150 yen, this means that
A.
it now takes $150 to buy one yen.
B.
the dollar has depreciated relative to the yen.
C.
the dollar's purchasing power relative to the yen has risen.
D.
the price of goods imported from Japan will fall.
【简答题】玉米制种母本人工去雄有何要求？
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