问题
单项选择题
离心泵的轴向推力的方向是（）。
A、指向叶轮出口
B、指向叶轮进口
C、背离叶轮进口
D、不能确定
答案
参考答案：B
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离心泵的轴向推力的方向是（）。
A、指向叶轮出口
B、指向叶轮进口
C、背离叶轮进口
D、不能确定
参考答案：B
What a busy day! The three boys were fed, bathed and changed into their nightclothes.Mary had them a story and finally they were asleep. “Babysitting (照看) the three boys aged eight, six and four is extremely ,” she thought. “Sleep, " she considered, "if only I could!" But she had difficult homework to complete. Leaning back, she her feet onto the sofa to get comfortable. Whoever said babysitting was a(n) way to make money obviously hadn't met the three boys, she thought.The television was on, the room was warm, and the lights were dim.Mary's felt heavier and heavier.I mustn't sleep, she thought—which was whatshe did, of course. Strangely enough, she soon that she was a world-famous chef (主厨). She made a and wore diamonds and designer clothes. Most days she by the pool, meeting the rich and famous or reading—her favorite hobby. She took the leading role in her own TV show. Then she woke up, shocked and confused. was pouring from the kitchen. Rushing to investigate, she was met by three little faces and some very burnt bread.
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