题目内容

There I met several people, two of ______ being foreigners.

A. them
B. which
C. whom
D. that

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There I met several people, two of ______ were foreigners.

A. which
B. who
C. whom
D. that

There I met several people, and two of _____ were foreigners.

A. which
B. whom
C. them
D. that

采暖系统中为了防止管道和管件因受热而发生弯曲破裂, 常在管路中设置( )

A. 疏水器
B. 除污器
C. 补偿器
D. 排气装置

在采暖系统中能排放凝结水并阻止蒸汽通过的设备是( )

A. 除污器
B. 补偿器
C. 疏水器
D. 排气装置