有轨起重机行车前必须松开锚定装置或夹轨器等装置。（）
A、正确
B、错误
参考答案：A
You are saying that everyone should be equal, and this is ______ I disagree with you.
A．why
B．where
C．what
D．how
磁悬液中的磁粉浓度应如何测定？
