第一产程末宫腔最大压力可达:
A.30~50mmHg
B.25~30mmHg
C.20~30mmHg
D.40~60mmHg
E.50~0mmHg
参考答案:D
Something _______ wrong with the machine, and it _______ not work.
A.being; could
B.going; should
C.were; might
D.went; would
简述两周中枢秘书机构的建立及其职能