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【单选题】

下列补体活性片段中属于过敏毒素的是( )

A.
C3a、C3b、C4a
B.
C3a、C4a、C5a
C.
C3b、C4b、C5b
D.
C5a、C3b、C4b
E.
C3a、C4a、C5b
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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...}