对耗能型缓冲器需进行复位试验,复位时间应不大于( )。A.60S B.90S C.120S D.150S
A: A.60S
B: B.90S
C: C.120S
D: D.150S
A: A.60S
B: B.90S
C: C.120S
D: D.150S
举一反三
- SMT回流焊制程管制参数中,恒温区(155℃~185℃)时间控制在() A: (90~110)s B: (40~60)s C: (60~120)s D: (110~140)s
- A1/A2型题 等速测试时代表快速测试的角速度一般为()。 A: 30°/s B: 60°/s C: 90°/s D: 120°/s E: 180°/s
- 金属带的均衡时间一般取() A: 120μS B: 70μS C: 150μS D: 100μS
- 水泥砂浆和水泥混合砂浆,搅拌时间不得小于()s。 A: 180 B: 120 C: 90 D: 60
- The story happened ______. A: in 1960's B: in his 60's C: in 60's D: in the 1960's