离心泵的效率是指离心泵的有效功率与离心泵的轴功率之积。
参考答案:错
第Ⅱ卷(共35分)
第四部分:(共三节,满分35分)
第一节:完成句子(共5 小题;每小题1分,满分5分)
71. We need more money for ______________ (科学的) research.
72. What a _____________ (巧合) that I was in Paris at the same time as you.
73. The problem seemed very __________ (困惑的). Few students could not work it out.
74. There is no __________ (可能性) that oil price will be reduced in the following month.
75. In order to make our trip ____________( 舒服的), we took everything we needed.
电力机车轮箍加热套装后,可以用高压风强迫冷却。