风切变警告的工作条件是()
A、1000英尺以上
B、离地到1000英尺以下
C、抬前轮到1500英尺以下
D、2000英尺以下
参考答案:C
阅读理解。
1. We need ________ kinds of things to make an ALL ABOUT ME box.
A. two
B. three
C. four
D. five
2. What should we do first to make an ALL ABOUT ME box?
A. Color the inside of the box.
B. Turn the box on its side.
C. Put the name inside the box.
D. Make a list of favorite foods.
3. An ALL ABOUT ME box tells about ________.
A. a toy
B. a book
C. a person
D. a picture
暴发调查常用的流行病学指标是()。
A.患病率
B.发病率
C.感染率
D.罹患率
E.续发率