在发生人身触电事故时,为了抢救触电人,可以不经许可,即行断开有关设备的电源,但事后应立即报告调度和上级部门。()
参考答案:对
补全对话:根据对话内容,从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
A: Hello! May I speak to Sam, please?
B: This is Sam speaking.
A:__1__.
B: No, noghing. Do you have any good idea?
A: __2__.
B: OK. __3__.
A: It's on Bridge Street. You can take the No.3 bus to the Xingfu Street Stop.(站) __4__. The new cinema is across from it.
B: Oh, I see. It is 2 o’clock now. __5__.
A: I don’t think you can get there in(在……之后) half an hour. Let’s meet at 2:45.
B: OK. See you then.
A: See you.
室温下,称取5.6g生石灰,放入100g水中(已知:该温度下Ca(OH)2的溶解度为0.16g/100g水),充分搅拌,下列判断错误的是( )
A.所得溶液溶质是Ca(OH)2
B.所得溶液是饱和溶液
C.溶液中溶质质量分数为5.6/(100+5.6)
D.溶液中溶质的质量小于0.16g