桥梁伸缩缝的类型有( )。
A.沉降缝
B.镀锌薄钢板
C.防震缝
D.钢制伸缩缝
E.橡胶伸缩缝
参考答案:B,D,E
用适当的介词填空。
1. Look the tiger.
2. What the mother kangaroo?
3. It's hard park a car a star.
4. Why are they picking the stones?
5. Koala bears like be quiet the day; They like to eat night.
6. What do you do Sundays?
7. My sister is listening music.
缓倾斜煤层倾角为()度。