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【单选题】
裸鼠对特异性肿瘤缺乏易感性的原因为（）。A.
第3、4对咽囊内胚层的缺陷造成胸腺发育不全。
B.
外淋巴组织中缺少或缺乏成熟T细胞
C.
裸鼠B细胞功能基本正常。
D.
裸鼠自然杀伤细胞数目正常甚至增多，产生的γ干扰素（IFN-γ）激活巨噬细胞。
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【简答题】1 The operator moved the brake valve to “_____________” when he saw a car on the track. 2 Before the ______________________ was installed, the train had too many wires. 3 Air brakes tend to have a lo...
【单选题】He could not ______ himself any longer from losing his temper when he learned that his teenage son had skipped class again.
A.
steer
B.
restrain
C.
nurture
D.
tend
【单选题】根据以下材料，回答题 I once had a friend that was diagnosed with， terminal cancer， and the news that he might only live up to six months was a great shock to him， his family， and his friends.However， in spite o...
A.
Satisfied.
B.
Surprised.
C.
Terrified.
D.
Confused.
【简答题】如果不以齿顶圆柱面作为测量齿厚的基准，且不以它作为切齿时的找正基准，则盘形齿轮的齿轮坯公差应规定哪几项?试述它们的名称(用图样标注的形式来解答)。
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