tan300°+ cos(-405°) sin750°= -tan60°+ cos45° sin30°= 2- 3.故答案为: 2- 3. 利用诱导公式,结合特殊角的三角函数,即可得出结论. 本题考点:运用诱导公式化简求值 同角三角函数基本关系的运用 考点点评: 本题考查诱导公式,特殊角的三角函数,考查学生的计算能力,正确运用诱导公式是关键. 解析看...
tan300°+sin450°=tan120°+sin90°=-tan60°+1=1- 3,故答案为:1- 3. 由条件利用诱导公式化简所给式子的值,可得结果. 本题考点:运用诱导公式化简求值 考点点评: 本题主要考查应用诱导公式化简三角函数式,要特别注意符号的选取,这是解题的易错点,属于基础题. 解析看不懂?免费查看同类题视频解析查看解答...
零偏重复性(deg/s) ≤0.05 ≤0.02 非线性(%) ≤500 ≤300 加速度计 量程(g) ±50(可定制) ±50(可定制) 零偏(mg) ≤5 ≤3 零偏稳定性(mg) ≤0.5 ≤0.1 零偏重复性(mg) ≤3 ≤1 可靠性((Kh MTBF)) 10 接口特性 电源(V) DC9-36 功耗(W @5V DC) ≤0.8 电气接口 数字RS42...
(E = 0.95, 可耐温至 +300°C) 0554 0051 硅热贴 (14g), 最大耐温 +260°C (用于增加探头表面的热传导) 0554 0004 ISO标定证书/温度;红外测温仪;标定点 +60°C,+120°C,+180°C 0520 0002 ISO标定证书/温度;红外测温仪;标定点 -18°C,0°C,+60°C 0520 0401...
根据您输入的内容,为您匹配到题目: **计算sin20°-cos20°的值是(保留四位有效数字)( )** A. -0.5976 B. 0.5976 C. -0.5977 D. 0.5977 **答案**: C **分析**:试题分析:本题要求熟练应用计算器,对计算器给出的结果,根据有效数字的概念用四舍五入法取近似数. 试题解析:按MODE,出现:DEG,按sin20...
Substrate after being cleaned and stoved is heated in PECVD vacuum chamber to 150-300 deg.c, N2 diluted SiH4 and NH3 is filled into the vacuum chamber to 1-5 Pa, and RF power is applied for discharge, so as to perform the deposition. The substrate with SiN film deposited is set in ...
-20 ~ +60 °C 电池类型 2×钮扣电池 (CR 2032) 电池寿命 300 h 重量 49g 尺寸 189 x 35 x 19 mm 材质/外壳 ABS 探头类型 NTC 量程 -30 ~ +220 °C 精度 ±1 % 的测量值 (+100 ~ +220 °C) ±0.5 °C (-30 ~ +99.9 °C) 分辨率 0.1 °...
SINEX Industrie Shanghai HangOu Mechanical & Electrical Equipment Co., Ltd. was established in 2006, and is specializing in the import of mechanical & electrical equipment spare parts, instruments and other products and brands of worldwide. These products are widely used in metallurgy, iron and ...
Embracing three sides of Castle Peak, a crescent is open to the sea. The beach is wide, stretching for more than 7 kilometers, and the width of the shallow sea ranges from 50 to 60 meters. Soft white sand, clear sea water penetration, the annual average temperature is over 25 DEG C,...
deg, degrees. C, analysis of Hα chemical shift differences with respect to random coil values (30). Sequential crowding of positive values in the bottom chemical shift index (CSI) plot indicates helical structures. Secondary structure elements are supported by a modified D2O exchange experiment. ...