总板效率可直接由公式计算得来。
参考答案：错
解析：影响塔板效率的因素多而复杂，塔板效率只能估算。
狂犬病病死率甚高，可能死因是
A．呼吸衰竭
B．循环衰竭
C．昏迷
D．伤口化脓引起脓毒血症
E．中毒性休克
句型转换，每空一词。
1. My name is Jack. (改为同义句)
_____________ _____________ Jack.
2. We have ten apples in the basket. (对画线部分提问)
_____________ _____________ apples _____________ you have in the basket?
3. There is a photo on the desk. (改为复数句)
There _____________ some _____________ on the desk.
4. Does Tom like reading books? (作否定回答)
No, _____________ _____________.
5. He is my best friend. (改为一般疑问句)
_____________ _____________ your best friend?
