数控车床加工凹槽完成后需快速退回换刀点，现用N200G00X80．；N210Z50．；程序完成退刀。
参考答案：对
若该企业安排甲、乙两组各自研发一种新产品，试估算恰有一组研发成功的概率.
句型转换。
1. 她擅长英语。
She ______ ______ ______English.
2. She sleeps 9 hours every night. (就画线部分提问)
______ ______ ______ She______every night?
3. Last year, I had a cat, I looked after her well. (改为同义句)
Last year, I had a cat, I ______ ______ ______ ______ her,
4.—Can you help me? I'm in trouble. (作肯定回答)
—______ ______.
5. Can you help me (to) learn English? (改为同义句)
Can you help me______ ______ ______?
