一等三角点测量中,要求日夜观测时段数要符合一定的比例,其主要目的是消弱()。
A.旁折光影响
B.望远镜照准误差
C.水平度盘的刻划误差
D.归零差
参考答案:A
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Which of the following describes a preterm neonate
A.A neonate weighing less than 2,500 g (5 lb, 8 oz).
B.A low-birth-weight neonate.
C.A neonate born at less than 37 weeks' gestation regardless of weight.
D.A neonate diagnosed with intrauterine growth retardation.