牙本质表面处理技术主要有以下两类:()()。
参考答案:去除复合层的表面处理技术;改善复合层的表面处理技术
阅读理解。
My name is Alan. I live in Beijing. Now I am sitting at the window. I often sit here. I can look at the street.
In Beijing the buses are blue. A bus is coming now.
There is a bus stop in front of our house. A lot of people are waiting for the bus. Look! An old woman is
coming. She often misses the bus, because she never runs. Today she is lucky. The bus driver is waiting for
her.
1. I often sit _____. [ ]
A. at the door
B. behind the window
C. at my window
D. near the table
2. There is a bus stop _____. [ ]
A. under our house
B. near our house
C. in front of our house
D. far away from my house
3. _____ are waiting for the bus. [ ]
A. A few people
B. A lot of people
C. Old woman
D. Young people
4. The old woman often misses the bus because she _____. [ ]
A. never runs
B. doesn't come
C. can't come
D. runs quickly
5. The buses in Beijing are _____.[ ]
A. too big
B. too small
C. black
D. blue
对下列哪些行为不能实施正当防卫( )
A.不法侵害
B.过失犯罪
C.作为犯罪
D.抢劫行为