供物理或化学诱变剂处理的单孢子悬液的孢子数一般控制在()
A、70万个/ml
B、80万个/ml
C、90万个/ml
D、100万个/ml
参考答案:D
Make the sentences in order according to the given clocks. 按照钟表给出的时间先后为下列句子排序。
1. 2. 3. 4.
( ) Lynn goes home with her friend.
( ) Lynn begins her lesson.
( ) Lynn gets up and has breakfast.
( ) Lynn reads books in the classroom.
正常成年人第二颈椎以下的椎管前后径的范围为()
A.3~5mm
B.6~10mm
C.10~21mm
D.25~30mm
E.32~35mm