老年性 * * 炎进行 * * 灌洗,常用的药液是
A.1%乳酸B.2%~4%碳酸氢钠C.0.1%苯扎溴铵D.0.1%呋喃西林E.0.9%生理盐水
参考答案:A
In order to test whether the mean IQ of employees in an organization is greater than 100, a sample of 30 employees is taken and the sample value of the computed test statistic, tn-1=3.4. The null and alternative hypotheses are:()
A. H0:μ=100; Ha:μ≠100.
B. H0:μ≤100; Ha:μ>100.
C. H0:μ=100; Ha:X≠100.
宋元时期,泉州成为“东方第一大港”,与埃及亚历山大齐名于世。出现了“市井十洲人”、“涨海声中万国商”的繁荣景象。这一景象说明
A.在集市从事贸易的商人来自十个国家
B.外国商人青睐中国的瓷器、茶叶等
C.泉州成为当时世界上最大的贸易海港
D.泉州城市建设很好体现了人文和自然的结合