减少轴封漏汽的途径是减小汽封间隙。（）
参考答案：错
换流变压器特点有（）。
A.短路阻抗大
B.绝缘要求高
C.有载调压范围宽
D.噪声小
_____ of the students in our class _____ girls.
A．Three fives; is
B．Three fifths; is
C．Three fifth; are
D．Three fifths; are
