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【单选题】

补体活性片段中过敏毒素作用最强的是()。

A.
C5a
B.
C2A
C.
sub>4a
D.
C3a
E.
C3b
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参考答案:
参考解析:
.
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【单选题】下面哪个代码片段是错误的?( )

A.
package mypackage; public class Rectangel {//doing something...}
B.
import java.io.*; package mypackage; public class Rectangel {//doing something...
C.
import java.io.*; class Circle{//doing something} public class Rectangel {//doing something ...}
D.
import java.awt.*; import java.io.*;package mypackage; public class Rectangel {// doing something...}