刮板输送机回煤过多,会造成()。
A.链环变形
B.底链过载
C.断链
参考答案:B
How do you find _______ to work with the foreign engineer?
A.this
B.that
C.it
D.yourself
盈利性指对细分出来的市场企业能够去开发或挤占。( )