VHDL常用的库是()。
A.IEEE
B.STD
C.WORK
D.PACKAGE
参考答案:A
The policeman asked the child _____ cross the street _____ the traffic lights turned green. [ ]
A. not, when
B. don't, before
C. not to, until
D. not, until
第一产程活跃期的减速期是指宫口扩张()
A.9~10cm
B.3~10cm
C.7~10cm
D.5~10cm
E.8~10cm