喀什是久负盛名的“瓜果之乡”,瓜田果树无处不有。请分析喀什成为“瓜果之乡”的自然条件。
参考答案:
①光照充足;②昼夜温差大;③有灌溉水源;④冬季寒冷,病虫害少。
流行病学调查资料在分析时一般不用
A.标准差
B.中位数
C.标准误
D.平均数
E.可信区间
An analyst does research about execution instructions. A trader who places a buy order at the best bid most likely:()
A. makes the market.
B. is inside the market.
C. takes the market.