变送器是将()转换为标准电信号的仪器,传感器则是将物理信号转换为电信号的器件。 A. 发布时间:2018-12-29 19:43 │ 来源:www.tikuol.com 题型:单项选择题 问题: 变送器是将()转换为标准电信号的仪器,传感器则是将物理信号转换为电信号的器件。A.物理测量信号B.非标准电信号C.化学测量信号D.数字信号
题型:单项选择题 一I had a great time in Swiss last winter.I went skiing with my friends —Wow! .A.Sounds really cool!B.Cheers!C.How interesting you are!D.I’II go there.too. 查看答案
题型:单项选择题 词组活用。 play an important role; be based on; believe it or not; even if; come up to 1. ____ we could afford (买得起; 付得起) it, we couldn't go abroad for our holidays. 2. Hard work ____ in his success. 3. The film ____ a novel by D. H. Lawrence.4. Your recent work hasn't ____ your usual high standards 5. ____, Bill cheated in the college entrance exam. 查看答案
题型:单项选择题 如图所示,静止在光滑水平桌面的布带上有一质量为m=1.0kg的小铁块,它离布带的右端距离为L=0.5 m,铁块与布带间动摩擦因数为μ=0.1,现用力从静止开始向左以a0=2 m/s2的加速度将布带从铁块下抽出,假设铁块大小不计,铁块不滚动,g取10m/s2,求: (1)将布带从铁块下抽出需要多长时间? (2)布带对铁块做了多少功? 查看答案