下塞柄时，开孔机离合器应（）
A、啮合
B、脱离
C、连接
D、分离
参考答案：B
-Do you know __________ this weekend?
-We plan to visit the Science Museum.[ ]
A. what we are going to do
B. what are we going to do
C. what we were going to do
D. what were we going to do
目前大学学费平均每年为5500元，假设学费平均上涨率为每年5%，那么邢女士的女儿读大学时学费平均每年的近似值为( )元。
A．7000
B．8000
C．9000
D．10000
