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病人,男,40岁。患有肥厚型心肌病1年余,在他服用的药物中,可减轻左心室流出道梗阻的药物是
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螺纹联接防松的目的是防止螺纹副的相对运动,按工作原理的不同有三种防松方式:摩擦力防松、和永久防松。
所有的螺纹联接都需要预紧。
螺纹拧紧后需要防松,目的是在防止螺旋副间再相对转动。
Listen to the following sentences and fill in the blanks.(1)A product title should contain color, size or ______________.(2)Product titles on Amazon are allowed up to _________________.(3)On some cross-border e-commerce platforms, you should avoid putting prices, _____________ symbols and suggestive commentary in the title.(4)The hooded jackets come in various colors and many different _________________.(5) The zip-hoodie is made from 50% cotton and 50% __________________.
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