质量督导有几种形式?
钢丝绳涂脂所选用润滑油脂要()。 ["A、得当","B、多量","C、少量","D、均匀"]
将构件和固定支座在连接处钻上圆孔,再用圆柱形销钉串联起来,使构件只能绕销钉的轴线转动,这种约束称为() ["A.固定铰链约束","B.滑动铰链约束","C.中间铰链约束","D.固定端约束"]
下列哪些是“七月”派作家?() ["路翎","绿原","牛汉","曾卓","彭燕郊"]
常见的铰链约束有三种,即() ①柔性约束; ②固定铰链约束; ③滑动铰链约束; ④中间铰链; ⑤上下铰链约束; ⑥左右铰链约束。 ["A.①②③","B.②③④","C.③④⑤","D.④⑤⑥"]
投用脱硫保护器要注意什么?