Thursday, September 22, 2022
单选题纸桶的标准代号是()A GB/T14187B GB 12463C GB/T13252D GB/T325.1...
Tuesday, August 29, 2023
Monday, September 19, 2022
单选题烟花爆竹产品燃放后不应继续燃烧超过()s。A 20B 25C 30D 35...
Thursday, December 1, 2022
判断题可编程序控制器只具数字量或模拟量输入输出控制的能力。A 对B 错...
Friday, August 11, 2023
测定胶粘剂中总挥发物,对电热恒温干燥箱的精度要求是不大于()...
Tuesday, September 20, 2022
Thursday, September 22, 2022
单选题GB11887-2008《首饰贵金属纯度的规定及命名方法》规定铂的仲裁方法是()A GB/T21198.1B GB/T21198.6C GB/T19720D GB/T9288...
Sunday, January 1, 2023
在原子发射光谱分析(简称AES)中,光源的作用是对试样的蒸发和激发提供所需要的能量。若对某种低熔点固体合金中一些难激发的...
Thursday, September 22, 2022
运动鞋钉在()以内可以使用合成材料跑道面层材料,跳高、跳远和标枪例外。...
Thursday, September 22, 2022
Wednesday, September 21, 2022
Thursday, September 22, 2022
Wednesday, September 21, 2022
()可由操作人员在设备操作过程中及交接班中完成,是一种不占据工时的设备保养方式。...
Friday, September 16, 2022
Wednesday, September 21, 2022
Thursday, September 22, 2022
玩具进行相应燃烧性能测试时,火焰高度为()(燃烧器垂直放置时)...
Thursday, September 22, 2022
Tuesday, September 20, 2022
Thursday, September 22, 2022