测量挥发性油品，若读数困难时，可以在量油尺上的液面读数附近涂上（）。
A、示水膏
B、示油膏
C、粉笔
D、其他多孔性材料
参考答案：B
Mr. Black, ＿＿＿＿＿ born in Kentucky, lived and practiced law in Missouri.
A．was
B．he was
C．although
D．who he was
