以下物质中不会引起食物中毒的是( )。
A.植物血凝素
B.有机磷
C.甲基汞
D.3-硝基丙酸
E.大豆黄酮
参考答案:E
We have a high regard for Mr. Black because he always tries to ________ his principles. [ ]
A. live up to
B. look forward to
C. catch up with
D. put up with
A.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G
B.a为动滑轮,B端钢缆受到滑轮组的拉力大小约为G
C.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为3G
D.a、c为动滑轮,B端钢缆受到滑轮组的拉力大小约为G