各级各类都有义务按规定承担卡介苗接种工作（）。
A.医疗机构
B.防疫机构
C.疾病控制机构
D.医疗预防保健机构
E.学校
参考答案：D
某建筑场地饱和淤泥质黏土层厚15～20m，现决定采用排水固结法加固地基。下述不属于排水固结法的是( )。
A．真空预压法 B．堆载预压法C．电渗法 D．碎石桩法
An earthquake hit the hometown of one of your friends, Xiao Wang, a week ago. Write a letter to condole with him on the disaster and offer help to him.
Do not sign your own name at the end of the letter. Use "Li Ming" instead.
Do not write the address.
