离心泵吸入室的作用是将液体从吸入管均匀地引入叶轮，减少离心泵吸入室的作用是将液体从吸入管均匀地引入叶轮，减少（）。
参考答案：水力损失
根据所给图画和英语句子猜出划线单词的意思。
A. B.
1. It is winter. December, January and February are in winter. In winter, the weather is cold and snowy.
Winter comes after Autumn.
2. It is spring. March, April and May are in spring. In spring, the weather is warm and rainy. Spring
comes after winter.
下列离子方程式中，正确的是（ ）
A．澄清的石灰水与稀盐酸反应Ca2++2OH-+2H+═Ca2++2H2O
B．用氢氧化钡溶液中和硫酸溶液：Ba2++OH-+H++SO42-=H2O+BaSO4↓
C．KI溶液与适量溴水反应：2I-+Br2=I2+2Br-
D．硫酸铝溶液中加入过量氨水Al3++30H-══Al（OH）3↓
B. 
B. 