罗茨风机的保护有有哪些？
参考答案：
A、过流；B、速断；C、零序；D、欠压；⑤联琐。
与密码子ACG相对应的反密码子是（）
A.UGC
B.TCG
C.GCA
D.CGU
E.TGC
Which of the following is considered a landmark ruling in interracial marriages
A．Loving v. Alabama.
B．Loving v. Virginia.
C．Loving v. U.S.
D．Loving v. Richard and Mildred.
