关于模拟信号和数字信号哪个说法是正确的（） ["数字信号的精度取决于二进制的位数","模拟信号的精度与信号线的质量、长度有关","模拟信号对电磁干扰非常敏感","数字信号可以使用低成本的导线"]
下列各项中哪一项是蛋白质合成所不需要的？（） ["mRNA","核糖体","tRNA","内质网","氨基酸"]
选择设备时应该考虑的因素包括（）。 ["维修性","可靠性","灵活性","节能性","环保性"]
物资管理的原则包括（）。 ["以进定销原则","质量原则","经济核算原则","减少库存量原则","以销定进原则"]
Immediately after starting a diesel engine, normal raw water and jacket water pressure are indicatedHowever, the jacket water temperature continues to rise, if there is no change in the sea temperature, you should suspect（） ["overloading in all cylinders","a jammed three-way thermostatic valve","chromate PH too low","a high level in the surge tank"]
影响整经过程中纱线张力变化的因素有哪些？各有何影响？均匀单根纱线、片纱张力应采取哪些措施？并说明理由。
