关于我国发射的“亚洲一号”地球同步卫星的说法，正确的是[ ]

搜题请搜索小程序“爱下问搜题”

问题不定项选择

A．若其质量加倍，则轨道半径也要加倍

B．它在北京上空运行，故可用于我国的电视广播

C．它以第一宇宙速度运行

D．绕地球运行的角速度比月球绕地球运行的角速度大

答案

答案：D

听力题

用所给动词的正确形式填空。（每小题1分，共10分）

小题1:My brother needs _____ （exercise）every morning.

小题2:Nick was so (excite) when he found his lost keys.

小题3:Bring Ms. Steen to the party without (tell) the her.

小题4: I really don’t know how _____ （learn）English well.

小题5: Frank asked me to give him some (advice).

小题6:This watermelon is (big) of all.

小题7:Are they able (write) their names?

小题8: (not forget) to add some salt to the soup.

小题9:I (watch) the movie with my friends in two hours.

小题10:He would like (invite) his friends to enjoy the dinner tomorrow.

选择题

根据下图海水综合利用的工业流程图，判断下列说法正确的是

已知：MgCl₂·6H₂O受热生成Mg(OH)Cl和HCl气体等。[ ]

A．过程①的提纯是物理过程，过程②通过氧化还原反应可产生2种单质

B．在过程③中将MgCl₂·6H₂O灼烧即可制得无水MgCl₂

C．在过程④、⑥反应中每氧化0.2 mol Br^-需消耗2. 24 L Cl₂

D．过程⑤反应后溶液呈强酸性，生产中需解决其对设备的腐蚀问题