管道穿孔事故的特点是().
A.漏油量小,事故点容易查找
B.漏油量大,事故点难以查找
C.漏油量小,事故点难以查找
D.漏油量大,事故点容易查找
参考答案:C
压力试验按照结构运行特点来分,可分为()和动压试验。
“Did you get _____ to the party?” “Yes, I replied to it this morning.”
A.an answer
B.an invitation
C.a question
D.a letter