循环血液中的肾上腺素和去肾上腺素来自（）。
参考答案：肾上腺髓质
下列煤矿与所在省区组合，正确的是[ ]
A、开滦——河北
B、徐州——浙江
C、大同——江西
D、平顶山——河北
Companies and institutions most commonly hire project management leaders with （）.
A．a strict standing in negotiating
B．experience in tricking business partners
C．integrity and expertise
D．a p link to local traditions
