往返丈量直线AB的长度为:其相对误差为()。
A.K=1/5000
B.K=1/4500
C.K=0.00022
D.K=-0.06
参考答案:B
Children are often full of __________ and they take great interest in everything.
A.concern
B.purpose
C.curiosity
D.strength
患者,女,29岁,经产妇,带宫内节育环半年,近半月余感腰酸、腰坠,并伴有少量 * * 出血。下列哪项检查无意义
A.妇科检查B.B型超声波检查C.宫颈刮片D.腹部X线片检查E.尿HCG检查