麻黄碱、伪麻黄碱、麻黄挥发油是麻黄的一种药理作用的有效成分，这种作用为
A．发汗B．镇痛C．抗过敏D．平喘E．强心、升压
参考答案：D
To be successful，the organization should be committed to addressing the management of risk______．
A．just before a meeting with a client
B．proactively and consistently throughout the project
C．as soon as time and cost estimates are ready
D．early in the execution phase
在财政收入形式中，国家采取有偿方式获取的是（）。
A、税收
B、公债
C、规费
D、国有资产收益
