高脂血或黄疸标本在340nm处有较强吸收峰,影响ALT、AST等多种指标的检测。()
参考答案:对
We have a lot of homework______. We are very busy today.
A.to do
B.doing
C.to doing
D.do
世界年平均气温分布图上,南半球等温线比较平直,原因是南半球[ ]
A.地势低平
B.平原面积广阔
C.海洋广阔
D.受太阳光热均匀