Which of the following must be true?
I. a Φ b=b Φ a
II. a Φ (a + 1) = a2
III. a/2 Φ b/2 = aΦb/2
Which of the following must be true?
I. a Φ b=b Φ a
II. a Φ (a + 1) = a2
III. a/2 Φ b/2 = aΦb/2
解释型号为SHL10-1.25/350-AII的锅炉的基本特性。
一台 DZL4-1.27-AII 的锅炉,适用燃料为()
一台DZL4一1.27一AII的锅炉,适用燃料为()
一台DZL4一1.25一AII型锅炉,其水压试验压力应为()MPa。
在AII-in-one整合结构的主板上,显示芯片直接集成在()中