设随机变量X服从正态分布N(1,4).已知φ(1)=a,则P(-1)=()
A.a-1
B.2a+1
C.a+1
D.2a-1
参考答案:D
临床资料:男,59岁,自诉剑突下疼痛、不适半年余。超声综合描述:饮水后扫查胃大弯处可见不均质中等回声,向腔内突起,表面不平,胃壁层次不清。超声提示()
A.胃息肉
B.胃溃疡
C.胃癌
D.胃脂肪瘤
You are the project manager for an initiative aimed at releasing a new product in the market. But because of government regulation, you will have to make some changes to the project scope and the WBS. Any approved modifications to the contents of the scope statement should be done through ______ updates.
A.scope management plan
B.work breakdown structure
C.project plan
D.none of the above