液压系统在日常检查时，应保证各油泵、油马达的安装及连接无松动，运转无（）。
参考答案：异响
用所给词的适当形式填空
1. I want some __________(tomato) for dinner.
2. There are some __________(orange) in the box.
3. The running star __________(eat) a lot.
4. He __________(watch) TV every day.
5. Thank you for __________(call) me.
6. She plays basketball very __________(good).
用折现率为13%计算的项目净现值为20万元，则内部收益率( )。
A．小于13%
B．大于13%
C．等于13%
D．无法判断
