按力学性质分，支撑剂分为（）（）两种类型。
参考答案：脆性；韧性
—Sorry for the delay.I got lost in the mountain.
—That's OK.You're safe and that's what________.
A．does
B．works
C．stays
D．counts
用于调用存储过程的对象是（）
A.ResultSet
B.DriverManager
C.CallableStatemet
D.PreparedStatement
