单选题
发布日期:2021-03-22
stuffing boxes eliminate the leakage problems usually associated with other gear pumps
it is not necessary to closely maintain design clearances with this pump
they are essentially self-priming and produce a high suction lift
these pumps are designed with extreme tooth angled
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边某和王某夫妻二人均为中国公民,婚后旅居巴西。因发生婚姻纠纷,巴西法律又不允许离婚,夫妻二人于1986年按巴西法律规定的方式达成长期分居协议,并请求中国驻巴西大使馆领事部予以承认和协助执行。我国应否承认和协助执行边、王二人达成的分居协议?为什么?
不得随意更改CTCS3-300T车载设备的车种,轮径,雷达参数等参数。
铁路局红外线监测中心热轴预报程序是怎样规定的?
表面活性剂的结构特征是同时具有极性的()和非极性的(),因此表面活性剂分子是一种既亲水又亲油的分子,具有两亲性。
下列属于我国法定计量单位的特点的有( )。
培训项目与课程开发之间的关系为()。
关于模拟定位机功能描述不正确的是( )。
小张在超市购物时,有位女士请她回答最喜欢喝哪种品牌的咖啡。研究者所采用的研究方法是( )。
MR设备不包括:()
车号识别系统车载主要包括机车标签,写入单元、()。
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