问题
单项选择题
在拧紧圆形或方形布置的()时,必须对称地进行。
A、成组双头螺柱
B、成组螺母
C、连接件
D、长螺母
答案
参考答案:B
在拧紧圆形或方形布置的()时,必须对称地进行。
A、成组双头螺柱
B、成组螺母
C、连接件
D、长螺母
参考答案:B
读一读,选择合适的问句。 | |
B: Yes. I can see many animals. A: 2.______________________ B: The tigers are fighting. The lions are sleeping. A: Can you see any kangaroos? B: Yes, I can. A: 3.____________________ ? B: The mother kangaroo is jumping. The baby kangaroo is sleeping. A: I like kangaroos very much. 4.__________________________? B: Yes, I do. |