A:十九世纪六七十年代,民族资本主义产生,是中国民族工业的起点
B:1927~1936年民族工业发展较快,农村经济也有较大进步
C:一战期间,民族资本主义迅速发展,民族工业走上独立发展之路
D:1953~1957年执行的一五计划,开始改变中国工业落后的面貌
自行车上的螺丝和螺帽属于____的简单机械。
In America, there are chores(杂活) for children of different ages. American people think that it's important to tell children their duty in the family.
Ages 4-6
Ages 6-12
Ages 13 and Up
-Make their bed;
-Clear dishes from the table;
-Set the table;
-Get the mail from the mailbox;
-Take care of pets;
-Cook simple food;
-Help wash the car;
-Vacuum(吸尘) and sweep;
-Take out the rubbish.
-Wash windows;
-Clean out fridge;
-Prepare a meal;
-Make shopping lists;
-Mow the lawn(剪草坪)
40÷8____40÷4 25×4____800÷4