西门子S7-300中,定时器的定时范围是( )。
A: 1ms-100s
B: 10ms-990s
C: 10ms-9990s
D: 1ms-9990s
A: 1ms-100s
B: 10ms-990s
C: 10ms-9990s
D: 1ms-9990s
举一反三
- 测得某电解质溶液两极的电阻为 0.1 KΩ,其电导为( ) A: 10 μS B: 100 S C: 10 mS D: 100 mS
- 测得某电解质溶液两电极间的电阻为0。1KΩ,其电导为( )。 A: 10 μS B: 10 mS C: 100 mS D: 100 S
- 1 ms/m =( )µS/cm A: 10 B: 1 C: 0.1 D: 0.01
- The author's main purpose in writing .this passage is ___________. A: to critically comment on Ms Harris's work B: to objectively report on Ms Harris's work C: to highly praise Ms Harris's work D: to totally reject Ms Harris's work
- 在12 MHz时钟脉冲的8051单片机系统中,机器周期有 。 A: 1 ms B: 12 μs C: 1 μs D: 12 ms