鹿特丹港在欧罗港区和马斯平原港区的南面开凿了与老马斯河相通的（）运河。
参考答案：哈特尔
My child didn't feel quite himself these days. The doctor said it was just a flu. What __________!
A．a surprise
B．a pity
C．a shame
D．a relief
由于浮动镗刀在镗刀杆的IL内径向可以自由移动，能补偿孔小心偏差，因此（）时采用浮动镗刀可以获得正确的孔形。
A.粗镗
B.半精镗
C.精镗
D.复合镗
