供给X线管的能量将有百分之多少转换成X线
A. 小于1%
B. 4%
C. 10%
D. 85%
E. 99%
间歇性排便带血,有肿物脱出肛门外,排便后可自行还纳。根据痔的临床分度,应为
A. I度内痔
B. Ⅱ度内痔
C. Ⅲ度内痔
D. Ⅵ度内痔
E. V度内痔
The meat box temperature control circuit, as used in ship service refrigeration system, is
A. two position control
B. signal speed floating control
C. proportional control
D. reset control
电磁阀应()检查一次,试验启动是否正常。
A. 每年
B. 每星期
C. 每月
D. 每季度