A:L1、L2都发光,L2比L1亮
B:L1、L2都不发光
C:L1发光,L2不发光
D:L2发光,L1不发光
计算412+313-8的结果是
从方框中选择适当的词, 并用其适当形式填空。
interesting, five, begin, race, more
My favorite festival of the year is the Dragon Boat Festival. It is on lunar May ____. I can eat ____ zongzi on this day. And I can also watch dragon boat ____ near my home. It's very ____. The festival means the ____ of hot summer. We usually have a big dinner in the evening.
项目
组别
水质
水量
水温
蛙卵数
孵出的蝌蚪数
A组
河水
500mL
23℃
30个
28只
B组
蒸馏水
10℃
9只
上述实验设计的不妥之处是( )