体检时保育员应搀扶或抱较小的婴幼儿上,下(),要帮助婴幼儿迅速()。
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How is a safe water mark,that can be passed close aboard on either side,painted and lighted?()
A. Black and white stripes with an interrupted quick flashing light
Black and red stripes with a Morse (A) light
C. Black and red stripes with an interrupted quick flashing light
D. Red and white stripes with a Morse (A) light
为何负调差特性的发电机在机端不能直接并联运行而经变压器后允许并联呢?
某一项目在测定过程中,当干扰物质与被测物直接结合,可使测定结果()。
A. 偏低
B. 偏高
C. 不确定
当静载加载分级较为方便时,按最大控制截面内力荷载工况要可分为()级。