鱼类急性毒性试验可用斑马鱼（Brachydaniorerio）作为试验用鱼。
参考答案：对
He said, “＿＿＿＿＿ a long way to school. ＿＿＿＿＿ a long way to go yet before we arrived.”
A．It is ； There is
B．There is ； It is
C．It is ； It is
D．There is； There is
设备维护的基本原则是什么？
