蟹的卫星DNA为只有AT两个碱基的重复序列组成。 ( )
参考答案:对
Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.
A.what is called
B.which is called
C.what it is called
D.which it is called
在计划完成后进行的评价性控制是( )
A.前馈控制
B.现场控制
C.预防控制
D.反馈控制