雷达反射率因子Z和被测小球质点直径的六次方成正比。
参考答案：对
用be动词am，is，are填空。
1. I ______________ going to the park this afternoon.
2. She ______________ going to take a trip tomorrow.
3. He ______________ going to watch TV tonight.
4. We ______________ going to the cinema this evening.
5. They ______________ going to the Great Wall next week.
轨梁厂800轧机属于（）。
A.三辊闭口可逆轧机
B.三辊半闭口可逆轧机
C.三辊闭口不可逆轧机
D.三辊半闭口不可逆轧机
