【判断题】塞曼效应实验中, π 线和 σ 线在平行于磁场方向传播时,看不到 π 线。
【判断题】π线和σ线在平行于磁场方向传播时,看不到π线。
【单选题】关于间接免疫凝集抑制说法正确的是
A.
已知抗原致敏颗粒载体和相应抗体,可测标本中是否存在和致敏抗原相同的抗原
B.
反向间接免疫凝集抑制试验用于检测标本中的抗原
C.
正向间接免疫凝集抑制试验用于检测标本中的抗体
D.
出现凝集现象,说明标本中存在与抗原致敏颗粒相同的抗原
E.
无凝集现象,说明标本中不存在与抗原致敏颗粒相同的抗原
【判断题】π线和σ线在平行于磁场方向传播时,看不到π线。
【单选题】读者通过自助借还机办理还书手续之后 , 应将图书归还至 ( ) 。
【简答题】用所给单词的适当形式填空。 1. _____ (be) your mother in Beijing last week? 2. He often _____ (play) basketball after school when he was a studerit. 3. —What ______you_____ (do) last night? —I _____ (watch) TV ...
【简答题】Richard found a job in a big office after he finished college. He liked to use his(1)___ and was good at his job. So he was often paid more than (得到的报酬多于) his workmates and he worked (2) _____ . But s...
【单选题】下列哪一个不是决定竖曲线的最小半径的因素()
【简答题】Richard found work in a big office after he had finished college. He liked to use his head and was good 46 his work. So he was often paid more than his workmates and he worked faster. But something wa...
【简答题】Mr. Johnson lives outside the town. He works in a post office. His wife is often ill and six children __26____ at school. He works hard but he is often short of __27____. In the end of every month his...