如图所示为核电站发电流程图。下列说法正确的是:
A.核能是不可再生能源
B.蒸汽轮机的效率总是小于1
C.蒸汽轮机将核能转化为机械能
D.发电机将机械能转化为电能
ABD
预存式自体输血的标准是()
A.血红蛋白大于105g/L,红细胞比容不低于31%
B.血红蛋白大于115g/L,红细胞比容不低于36%
C.血红蛋白大于100g/L,红细胞比容不低于30%
D.血红蛋白大于110g/L,红细胞比容不低于33%
E.血红蛋白大于108g/L,红细胞比容不低于32%
The ARPA may swap targets when automatically tracking if two targets()
A.are tracked on reciprocal bearings
B.are tracked at the same range
C.are tracked on the same bearing
D.pass closely to each other