当平面平行于圆柱轴线截切时,截交线的形状是();当平面垂直于圆柱轴线截切时,截交线的形状是圆;当平面倾斜于圆柱轴线截切时,截交线的形状是()。
参考答案:两平行直线;椭圆
根据句意、汉语意思及首字母提示,完成句子,每空一词(5分)
1. I haven't seen my dog for three days. I'm very w about him.
2. You should be more c _______ when you are doing maths exercises.
3. Tom is (期待) his birthday present from his grandparents.
4. Mr Green likes the little boy called Tom. Because he is very (诚实的).
5. Most of the children in my class are i________ in animals.
双侧眼睑下垂见于( )
A.脑脓肿
B.脑出血
C.重症肌无力
D.脑炎
E.蛛网膜下腔出血