采用附加零件法修复零件时不仅应保证零件机械加工后的强度要求,而且要求衬套材料应与零件材料具有相同的()
A.机械强度
B.硬度
C.导热性能
D.热膨胀系数
参考答案:D
阅读理解。
There is a shy girl in our class. She is thirteen years old. She is not tall and she is not short. She
is a little fat. Her face is round, like an apple. She has two big black eyes and 'a small nose. Her mouth
is big, but her ears are small. Her hair is short and black. She likes the color red. But today she is
wearing a yellow sweater, blue jeans and brown shoes. She dislikes getting up early, so she is usually
late for school. She doesn't like to talk to others. She likes little animals. She has a little black dog,
She and the dog are good friends.
1. How old is the girl?
A. She is 13 years old.
B. She is 11 years old.
C. She is 12 years old.
D. She is 14 years old.
2. How tall is the girl?
A. She is tall.
B. She is short.
C. She is medium.
D. She is fat.
3. The girl's hair is _______.
A. curly
B. straight
C. short
D. long
4. The girl's favorite color is _______.
A. red
B. black
C. brown
D. yellow
5. The girl likes little _______.
A. flowers
B. animals
C. trees
D. toys
实验动物繁育、生产设施和动物实验设施在环境要求及设施管理上是基本()的,只有这样,才能尽量使实验动物的生理与心里保持稳定,不致影响实验结果。()
A.一致
B.不同
C.有差异
D.合格