气相色谱中FID的氢空比一般采用()。
A.1:1
B.1:2
C.1:5
D.1:10
参考答案:D
可做广告的药品是()
A.芬太尼
B.乙酰螺旋霉素
C.胰岛素
D.布桂嗪
用所给词的适当形式填空
小题1:Look !There are a group of boys______ (play) volleyball.
小题2:I’m very _______(surprise) to meet my friends in this city.
小题3:He wants to see the koalas_____(one)
小题4:where’s Jim? He` s ______ (lie) on the beach .
小题5:–How’s the weather in Shanghai in summer? ---It’s ______(rain).