最早提出烧灼法断脐预防脐风的儿科专著是()
A.《小儿药证直诀》
B.《小儿卫生总微论方》
C.《幼科发挥》
D.《保婴撮要》
E.《幼幼集成》
参考答案:B
—Why did you come back so early?
—Because the English Party has been _____ till next Friday. [ ]
A. put on
B. put off
C. put away
D. put out
防止误操作的闭锁装置有()。
A.机械闭锁
B.电气闭锁
C.电磁闭锁
D.微机闭锁