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【单选题】
急性经口毒性试验中的剂量设计,通常要求( )。A.
相邻组间的剂量差相等
B.
相邻组间的剂量对数差相等
C.
各组间染毒剂量以相差 5 — 10 倍为宜
D.
没有什么特殊要求
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反馈参考答案：
举一反三
【简答题】What were the two boats? One was a ______ and the other was a Japanese fishing boat.
【单选题】6 The ball went towards a passing boat. It went _____ of a passing boat.
A.
(A) forwards
B.
(B) forward
C.
(C) in the direction
D.
(D) in direction
【简答题】____________(决定取消搜索) when there was no hope of finding the missing boat.
【单选题】The ball went towards a passing boat. It went ______ of a passing boat.
A.
forwards
B.
forward
C.
in the direction
D.
in direction
【单选题】— What are the boys doing? — They _______________ in the boat. [ ]
A.
sitting
B.
are sitting
C.
sit
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