离心泵噪音大可能是润滑油质量不合格或（）。
A.润滑油过多
B.润滑油过少
C.润滑油型号不对
D.与润滑油无关
参考答案：C
用所给词的适当形式或按要求填空。
1. I'm afraid I have _______ (not) time to play with you.
2. He'd like a hamburger and some ________ (fish).
3. Would you like something _______ (drink)?
4. Help ________ (yourself) to some coffee, kids.
5. I can two _______ (woman ) under that big tree.
温带濒危非针叶木制饰面用木单板
