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(作业) 5.3 下图所示电路可以实现电动机的( )(正转、反转、正反转)控制;在控制电路中,交流接触器 KM F 和 KM R 的常闭触点作用是( )(自锁、互锁),保证交流接触器 KM F 和 KM R 不能同时动作。按钮 SB1 的是电路的( )(启动按钮、停止按钮)。
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【简答题】按要求填空： （1）写出下列物质的化学式：含6个碳原子的链状单烯烃 ，相对分子质量为72的烷烃 （2）在戊烷的各种同分异构体中，一氯代物只有一种的结构简式是 （3）用系统命名法命名烃： 。 （4）2-甲基-1,3-丁二烯与等物质的量的Br 2 反应，生成的产物有___________种， 该反应的类型为 反应。 （5）写出由丙烯制备聚丙烯的反应化学方程式 。 该反应的类型为____________...
【简答题】如图所示的是常用的实验装置． （1）写出仪器a的名称： ，b ． （2）加热氯酸钾和二氧化锰固体制取氧气，反应中二氧化锰起 作用，反应的化学方程式为 ．为了制取和收集干燥的氧气应该选择的装置有（填序号） ． （3）装置①可以进行多个化学实验，请写出一个用该装置进行实验的化学方程式： ． （4）加热无水醋酸钠和碱石灰能得到甲烷，则实验室制取甲烷的发生装置选 ；已知甲烷的密度小于空气，难溶于水．则可用...
【单选题】He suddenly became ________ that he was the only person who wasn’t the only person who wasn’t dressed formally at the reception.
A.
awake
B.
sensible
C.
sensitive
D.
conscious
【简答题】He suddenly became _______ that he was the only person who wasn't dressed formally at the reception.
【简答题】Fill the blanks with what you hear. Traditionally, the 1 women gather after the 2 , and the bride throws her 3 to them. The one who 4 it will, according to tradition, be the next one to get married. A...
【单选题】He suddenly became ________ that he was the only person who wasn't dressed formally at the reception.
A.
subconscious
B.
conscious
C.
unconscious
D.
serious
【简答题】A Brave Maid A wooden vase from the Ming Dynasty at the entrance of the reception hall ___ 1 (amaze) everyone. The artists designed it in a rare style and selected __ 2 (value) jewels to decorate it. ...
【单选题】听力原文：I'm sorry I'm late. But I was waiting for you at the reception desk near the gate. It's lucky I thought that you could be here in the lobby. Where did the speaker think they were supposed to meet...
A.
At the reception desk.
B.
In the lobby.
C.
At the gate.
D.
At the hotel.
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