原子吸收光谱分析的定量方法―标准加入法，消除了（）的干扰。
A、背景吸收
B、分子吸收
C、物理
D、光散射
参考答案：A
简述中外社区建设比较。
If a project manager communicates a verbal message to a subordinate and the subordinate leaves without saying a word，the project manager should assume that______．
A．the message was understood
B．the message was not understood
C．the message may not have been understood
D．the information was not appropriate
