“安全管理证书”系指签发给船舶，表明其公司和船上管理已按照认可的（）运行的证明文件。
参考答案：安全管理体系
.Sara had _________ the disadvantages of her background and became a successful lawyer at last .
A．recognized
B．struggled
C．prevented
D．overcome
享有独家专营权的贸易方式是（）。
A.包销
B.定销
C.经销
D.代理
