问题
单项选择题
关于操作中的往复泵，如下说法正确的有几个？（）
①不开旁路阀时，流量与出口阀的开度无关；
②流量与活塞的行程无关；
③流量与转速无关；
④开启旁路阀后，输入下游设备的液体流量与出口阀的开度无关。
A.1
B.2
C.3
D.4
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
关于操作中的往复泵，如下说法正确的有几个？（）
①不开旁路阀时，流量与出口阀的开度无关；
②流量与活塞的行程无关；
③流量与转速无关；
④开启旁路阀后，输入下游设备的液体流量与出口阀的开度无关。
A.1
B.2
C.3
D.4
参考答案：A
My friend Michelle is blind, but you'd never know it. She makes such good use of her other ____, including her "sixth Sense", that she rarely gives the impression she's ________ anything. Michelle looks after her children pretty much like the rest of us, ________ that she doesn't push too hard on them, ________ really benefit a lot from her relaxed attitude. She knows when to clean the house, she moves around so fast that often ________ don't realize she's blind. I ________ this the first time after my six-year-old daughter, Kayla, went to play there. When Kayla came home, she was very ________ about her day. She told me they had baked cookies, played games and done art projects. But she was ________ excited about her finger-painting project. "Mom, guess what?" said Kayla, all smiles "I learned how to ________ colors today! Blue and red make purple, and yellow and blue make green! And Michelle ________ with us." To my great ________, my child had learnt about color from a blind friend! Then Kayla continued. "Michelle told me my ________ showed joy, pride and a sense of accomplishment. She really ________ what I was doing!" Kayla said she had never felt how good finger paints felt ________ Michelle showed her how to paint without looking at her paper. I realized Kayla didn't know that Michelle was blind. It had just never ________ in conversation. When I told her, she was ________ for a moment. At first, she didn't believe me. "But Mommy, Michelle knew exactly what was in my picture!" Kayla _______. And I knew my child was ________ because Michelle had listened to Kayla describe her artwork. Michelle had also heard Kayla's ________ in her work, We were silent for a minute. Then Kayla said slowly, "You know, Mommy, Michelle really did 'see' my picture. She just used my ________." Indeed, she uses a special type of "vision" that all mothers have.
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