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【单选题】

某一α-螺旋片段含有180个氨基酸残基,问此片段含有多少个螺旋周期?有多长?( )

A.
50个周期;270 nm
B.
50个周期;7.5 nm
C.
50个周期;170 nm
D.
50个周期;27 nm
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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...}