埋地管道组焊时,必须保证管道清洁。
参考答案:对
-Do you know the boy________ is sitting next to Peter?
-Yes. He is Peter's friend. They are celebrating his ________ birthday.
A.who; ninth
B.that; nineth
C./; nineth
D.which; ninth
下列不在一切险承保范围内的险别是()
A.偷窃提货不着险
B.渗漏险
C.交货不到险
D.破碎险