【判断题】用NaOH标准滴定溶液滴定一元弱酸时,一般可选用酚酞作指示剂
【判断题】工业控制领域中以继电器控制的缺点是生产工艺多变的系统适应性差,一旦生产任务和工艺发生变化,就必须重新设计,并改变硬件结构。
【单选题】Which of the following is closest to the meaning of this text?
A.
The fear of ill exceeds the ills we fear.
B.
Caution is the parent of safety.
C.
Do not wash your dirty linen in public.
【单选题】What happens when the sum of roll and speed brake commands exceeds the maximum possible deflection of a spoiler ?
A.
- The speed brake function is inhibited.
B.
- All spoilers receive an additional deployment order until one reaches its maximum possible deflection.
C.
- The symmetrical surface is retracted until the difference between the two surfaces is equal to the roll order.
【单选题】以下何穴宜用深刺法() A. 百会 B. 印堂 C. 内关 D. 环跳 答案 D
【判断题】用NaOH标准滴定溶液滴定一元弱酸时,一般可选用酚酞作指剂。()