If the place named for the loading is simply a port or dock,notice of readiness may be given as soon as the ship arrives()although she is not in the particular spot where the loading is to take place.
A. in the loading place
B. in the port or dock
C. in the loading spot
D. in the discharging spot
患者,25岁,男性,尿频,排尿有不适感,及腰骶、会阴部疼痛,便后或排尿后尿道有白色分泌物溢出。首先应考虑是()
A. 子痈
B. 精窿
C. 子痰
D. 肛痈
E. 精浊
超声波知识中,"在一定的外力作用下,晶体发生压缩或伸长变形,在物质表面出现电荷,这种由力转化为电的现象"属于()
A. 声波
B. 超声波
C. 压电效应
D. 逆压电效应
E. 超声波的发生