典型心绞痛发作错误的是()
A.体力活动是常见诱因
B.部位在胸骨中上段,界线清楚
C.疼痛可放射至左肩
D.为压榨性疼痛
E.通常持续3~5min
参考答案:B
_____ I toured Hailin, I was deeply impressed with its beautiful parks. [ ]
A. For the first time
B. At first
C. It was the first time
D. The first time
某同学用刻度尺量出自己脚掌长度为25.65,他的错误在于______,根据测量对象情况,你认为应选用最小刻度是______得刻度尺较为恰当.