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?