户籍证明工作主要是居民身份证及其他人口证件的签发和验证工作。( )
参考答案:对
As there is no direct sailing () your port this month, please amend your L/C to allow partial shipments.
A.to
B.for
C./
D.on
什么是模具?什么是塑料模具?模具具备什么特点?