某工程双代号时标网络计划如下图所示,其中工作A的总时差为()周。
A.1
B.2
C.3
D.4
参考答案:A
直肠指诊时肛门剧痛的可能是()
A.直肠癌
B.肛裂
C.直肠息肉
D.肛瘘
E.内痔
She was knocked ______ by a car and now is still _____.[ ]
A. down ; in danger
B. off; dangerous
C. down ; dangerous
D. off; in danger