某生化指标在人群中呈正态分布,制定其参考区间常用:()
A. X±s
B. X±1.96s
C. X±2.58s
D. 取百分位数法第5%和第95%百分位的数值
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His imagination transformed shadows into a monster.()
A. a beast
B. a ghost
C. a giant
D. an angel
下列化合物中,存在p-π共轭体系的是( )。
A. 甲苯;
B. 苯酚;
C. 苄醇;
D. 苯乙酸。
It is no use debating the relative merits of this policy.()。
A. **
B. taking
C. discussing
D. expecting
Insects thrive all over, from the hottest deserts to the snow-clad peaks of lofty mountains.()
A. silently
B. totally
C. everywhere
D. overhead