孤立运行机组的转速随负荷变化而变化。负荷增加，转速升高，负荷减少，转速下降。（）
参考答案：错
When you are in trouble, you may _______ your teacher and classmates for help.
A．turn away
B． turn around
C．turn back
D．turn to
尺寸精度
