密封油高位油槽是在正常情况下提供密封油。
参考答案:错
因式分
(1)2x(a-b)-(b-a);
(2)x(x+4)+3;
(3)x2-2x+1-y2.
I'm______ building a new factory here. It will be bad for the environment. [ ]
A. to
B. for
C. with
D. against