钩虫病的发病机制与病理改变包括()
A.皮肤损害
B.钩虫吸血量远多于渗血量
C.诱发过敏反应
D.小肠黏膜伤口渗血
E.上消化道出血
参考答案:A, C, D
During the day,a vessel picking up a submarine cable shall carry().
A.three shapes,the highest and lowest shall be red balls,and the middle shall be a white diamond
B.two black balls
C.three shapes; the highest and lowest shall be black balls,and the middle shall be a red diamond
D.three shapes; the highest and lowest shall be black balls and the middle shall be a black diamond
用熔断器保护的高压电器和导体可不验算热稳定,但动稳定仍应验算。( )