对外援助.交换和赠送的出境植物.植物产品,无须向检验检疫机构报检。
参考答案:错
柴油机工作时,将柴油变为高压油的是()。
A.柴油滤清器
B.输油泵
C.喷油泵
D.喷油器
Products which are made from dirts and are ______ high temperatures are known as ceramics.
A.tempered in
B.subjected to
C.exposed to
D.baked in