在12‰及以上的高坡地段，按调车办理取送车列时，关门车数20辆以上不得超过多少？
参考答案：
关门车数20辆以上不得超过所挂辆数的6%。
根据要求变换句型，每空一词。
1. He eats lunch at half past twelve. (改为一般疑问句)
__________ he __________ lunch at half past twelve?
2. His father is a factory manager. (对划线部分提问)
__________ does his father __________?
3. Roy comes from America. (完成同义句)
Roy __________ __________ America.
4. My brother usually wears jeans to school. (改为否定句)
My brother __________ usually __________ jeans to school.
5. He has got a small orange. (用a big one 改为选择疑问句)
__________ he got a small orange __________ a big one?
电动机的降压启动比全压启动的启动电流是大是小？
