在一般情况下,分馏塔顶安装2个安全阀。
参考答案:对
He caught a bad cold. He ____on more clothes that day. [ ]
A. should have put
B should have putted
C. had put
D. was put
西斯蒙第代表的是()的利益。
A.土地所有者
B.封建贵族
C.小资产阶级
D.大资产阶级