货车运用工作的指导方针是:牢固树立()的思想。
参考答案:“安全第一、预防为主”
“四苗免疫”的内容包括卡介苗、脊髓灰质炎疫苗、麻疹疫苗和乙肝疫苗.______.
Unwilling to _____his children, the old couple moved to the nursing home.
A.be burdened with
B.be burdened by
C.be a burden with
D.be a burden on