数码相机的LCD显示器如果()时,一定要关闭。
A.不用
B.图片放大
C.图片保护
D.图片删除
参考答案:A
下列免疫学测定方法敏感性最高的是()
A.沉淀反应
B.凝集反应
C.ELISA
D.放射免疫测定
E.补体结合试验
—I wonder why Mr Green hasn't showed up at the meeting yet.
—I'm not sure,but he________in a traffic jam driving here.
A.could be stuck
B.might have been stuck
C.might be stuck
D.must have been stuck