扑救火灾的过程中,将水直接喷注在燃烧物上,使燃烧物温度降低到燃点以下而熄火,其灭火方法称为()。
A、冷却法
B、窒息法
C、隔离法
D、综合法
参考答案:A
根据对话内容,在每个标有题号的空白处填入一个适当的句子,使对话完整,合乎情景。
A: Hi, Tom! Tomorrow is Sunday. What are you going to do?
B: I've no idea. 1_______?
A: I'm going to work on my uncle's farm. Would you like to come with me?
B: 2_______. How far is it?
A: About 10 kilometers.
B: 3_______?
A: We can go there by bus.
B: How long will it take us to get there?
A: About half an hour.
B: 4_______?
A: Let's meet at the bus stop at 7 o'clock.
B: 5_______. See you then.
A: See you tomorrow.
(1)升降机匀速上升;
(2)升降机以4 m/s2的加速度匀加速上升;
(3)升降机以5 m/s2的加速度匀加速下降。