机体再次接触相应抗原一般是24小时后即发生接触性皮炎,多少小时达高峰()
A.24~48
B.24~72
C.48~72
D.48~96
E.72~96
参考答案:D
What do you need?[ ]
A. We are flower seeds.
B. We need flower seeds.
C. We have flower seeds.
我国南方地区的东面和南面分别濒临东海和南海。( )