黄曲霉毒素会导致细胞癌变,黄曲霉素属于下列哪种致癌因子( )
A:化学致癌因子
B:物理致癌因子
C:病毒致癌因子
D:生物致癌因子
如图,已知△ABC∽△ADE,AE=5cm,EC=3cm,BC=7cm,∠BAC=45°,∠C=40°.
(1)求∠AED和∠ADE的大小;
(2)求DE的长.
Our Summer Camp
When
On July 5th
Where
A ____mountain village
Who
Stay with the____
What
In the morning, we'll learn to ____animals from the local people.
In the afternoon, we'll____about the river.
In the evening, we'll enjoy the bright____.
一个优秀班集体需要每个成员团结一心互相帮助.需要每个同学发挥所长奉献集体,更重要的是需要( )