鳃的功能有哪些（）
A、呼吸
B、营养
C、排泄
D、调节渗透压
参考答案：A, B, C, D
肝癌淋巴转移最常见的是
A．左锁骨上淋巴结
B．肝门淋巴结
C．主动脉旁淋巴结
D．胰腺旁淋巴结
E．胃旁淋巴结
A stopper used in securing the ground tackle for sea that consists of a grab attached to a turnbuckle is a（）.
A.riding pawl
B.buckler
C.devil's claw
D.locking ring
