华支睾吸虫的第二中间宿主是()
A.海鱼、海虾
B.淡水螺
C.淡水鱼虾
D.麦穗鱼和鲤科鱼类
E.各类鱼虾
参考答案:C
Chairman Xi Jinping had _______ friendly talk with US President Obama in ______ America last month.
A.a; /
B.the; /
C./; the
D.a; an
循环冷却水系统运行程序为:预膜—清洗—日常运行。