搜题请搜索小程序“爱下问搜题”
问题 选择题

科学家最近研制出利用太阳光产生激光，并在催化剂作用下使海水分解得到氢气的新技术．下列说法不正确 的是（　　）

A．该技术使水分解的化学方程式为2H2O

太阳能
.
催化剂
2H2↑+O2↑

B．水分解和氢气燃烧都不会产生污染

C．水分解产生氢气的同时释放出巨大的能量

D．利用该技术产物可以将化学能转化为热能

答案

答案：C

填空题

根据语境，用恰当的语言完成对话。

Jack: Hey, Lily. You look unhappy. 小题1:___________________________________________?

Lily: I argued with my mom yesterday evening. She didn’t talk with me any more.

小题2:________________________________________?

Jack: Mother’s Day is coming. You could buy her some flowers and say you are sorry.

Lily: That sounds like a good idea. Jack, I called you up yesterday evening, but there was no answer.

Jack: When did you call me?

Lily: At 7:15. 小题3:___________________________________________?

Jack: I was watching CCTV news from Boston at that time. I’m sorry I didn't hear it.

Lily: That’s OK. 小题4:__________________________________________?

Jack: The reporter said two explosions (爆炸) had taken place near the Boston (波士顿) Marathon finish line. 176 people had got injured and 3 people had died (死) including Lv Lingzi, a Chinese girl.

Lily:小题5:_________________________________________.

查看答案
单项选择题

标准状态指（）

A.温度为273K，压力为101.325kPa时的干物质状态

B.温度为0℃，压力为101.326kPa时的干物质状态

C.温度为273K，压力为101.325kPa时的物质状态

D.温度为20℃，压力为101.325kPa时的物质状态
查看答案