【单选题】下列关于镗模底座的论述,( )是错误的。
A.
镗模底座是夹具的主要支承元件之一,应有足够的强度和刚度。
B.
镗模底座上安装定位元件和镗模支架等元件的平面应铸出相应的凸台面。
C.
为保证镗模底座的强度与刚度,底座的高度值越大越好。
【单选题】A sail hook is used for().
【单选题】This document is ______ unless it is offcially stamped.
【单选题】_______ was first used to drive a ship in 1801, replacing the sail.
【判断题】∀ x(F(y) → G(x)) 等值于 F(y) → ∃ xG(x).
【单选题】I was about to sail away ______ I heard the sound of stamping and singing on the bank,
【判断题】镗模底座上安装定位元件和镗模支架等元件的平面应与底座其余平面平齐,以方便铸造加工。
【简答题】This document is the property of Roll-Royce limited and may not be copied or used for any purpose other than that for which it is supplied without the express written authority of Roll-Royce limited.
【判断题】镗模底座上安装定位元件和镗模支架等元件的平面应铸出相应的凸台面,其高度一般为3~5mm。
【单选题】This document is ______ unless it is officially stamped.