MGTY400/930-3.3D型采煤机是多电机驱动、横向抽屉式布置的（）采煤机。
A.机械牵引
B.热力牵引
C.压力牵引
D.电牵引
参考答案：D
下面所列出的“水”中属于纯净物的是（ ）
A．蒸馏水
B．消毒水
C．海水
D．雨水
Now many people move into cities in order to have their children___.
A．better educate
B．receive well education
C．better educated
D．accept better education
