塔底重沸器大封头漏，漏出来的是蒸汽，所以紧换热器的工具必须是铜制。
参考答案：错
解析：塔底重沸器大封头漏，漏出来的是液化气，所以紧换热器的工具必须是铜制。
I suggested to my father that we________to Dalian for a holiday this summer, but the expression
on his face suggested that he________to it. [ ]
A. go; shouldn't agree
B. would go; shouldn't agree
C. go; didn't agree
D. would go; didn't agree
下列选项中不受刑事追究的是( )。
A．提供了虚假的证人证言
B．由于害怕报复，提供了没有签名的证人证言
C．提供了次要的犯罪事实，故意隐匿了被告人的严重罪行
D．有意提供了使某无辜者受到法律追究的证人证言
