在AutoCAD 2009中,坐标系分为国家坐标系和用户坐标系。
参考答案:错
Follow the Chinese. Fill in the blanks. 根据中文提示,完成下列句子。
1. Li Ming, are these your____ (行李箱)?
2. This is the____ (厨房) where we can cook.
3. We wash the dishes in the____ (水槽).
4. The (冰箱) is cold inside. The juice is in it.
5. You can wash your hands in the (洗澡间).
6. The dishes are (脏的). I have to wash them.
7. We cook breakfast on the____ (炉灶).
8. The students are studying. The classroom is____ (安静的).
9. Look! Mr. and Mrs. Smith are sitting on the (沙发).
10. Breakfast is (准备好的). We can enjoy it.
安静时,细胞膜外正负的稳定状态称为()。
A.极化
B.超极化
C.反极化
D.复极化
E.去极化