
提问人:网友c********1
发布时间:2022年3月19日 23:16
[判断题]
为了在显微镜下观察纤维截面形态,首先要沿纤维的长度方向制作纤维切片。()


Listen to the recording and fill in the blanks with what you hear.
There are about 3.7 million businesses in the UK. About 75% of British jobs are in (1) industries—hotels, restaurants, travel and shopping. These are the fastest (2) businesses and employ over twenty million people. Most British people work a five-day week. The working week is, (3) , the longest of any country in Europe. In 1998 a new law (4) . The law says that workers do not have to work more than 48 hours a week if they don't want to. According to the law, British employers must give their workers (5) of 24 days a year.
重铬酸钾是比KMnO4更强的一种氧化剂,它可以在HCl介质中进行滴定。