Chủ đề:
Bài 20. Chất dẫn điện và chất cách điện - Dòng điện trong kim loạiCâu hỏi:
Không khí có dẫn điện không?
Q1: Which animals are considered the source of Covid-19?
Q2: Which place was Covid-19 first identified?
Q3: What are the symptoms that Covid-19 can cause? Q4: How can I avoid getting infected? (fill in the missing blanks) • Hand (1a) __________ is the key to preventing infection. You should (1b) _______ your hands often and thoroughly with soap and water for at least 20 seconds and avoid touching them with (1c) ________ hands.(2) Wearing _______________ help prevent further spread of infection from those who are sick to others around them. • Avoid close (3) ______ with people who are sick, especially people exhibiting respiratory symptoms and fever.If any one has been in close contact with a confirmed COVID-19 case, he / she should (4) ____-_______ for 14 days.Bài toán 16: Chiều cao của 50 học sinh lớp 5 (tính bằng cm) được ghi lại như sau: 102 113 138 111 109 98 114 101 102 111 127 118 111 130 124 115 122 126 103 108 134 108 118 122 99 109 106 109 107 106 122 133 124 108 102 130 107 114 104 100 104 141 103 108 118 113 138 112 147 114 a) Lập bảng phân phối ghép lớp (98-102); (103-107);…;(143-147) b) Tính số trung bình cộng.