采用如下哪种叶轮的离心泵适合输送高黏度的液体或悬浮液？（）
A.开式叶轮
B.闭式叶轮
C.半开式叶轮
D.应采用何种叶轮与液体的性质无关
参考答案：A
将正确译文的序号写在括号里。
1. 我看见了大象宝宝。[ ]
A. I see the baby elephant.
B. I see the mother elephant.
2. 她正在做什么？[ ]
A. What is he doing?
B. What is she doing?
3. 熊猫妈妈怎么样？[ ]
A. What about the baby panda?
B. What about the mother panda?
4. 对不起，鸭子不会飞。[ ]
A. Sorry. Ducks can't fly.
B. Excuse me. Ducks can't fly.
立体声的五种拾音方式。
