（）雌雄虫体均为寄生虫，无背甲，不具卵囊
A.桡足类
B.鳃尾类
C.等足类
D.枝角类
参考答案：C
---How did you find your visit to Moscow, Mike?
---__________.
A．Oh, wonderful indeed
B．I went there alone
C．First by plane and then by train
D．A guide showed me the way
试述特种加工技术的应用？
