Tom is one of ___ in the football team.
A. tall boy
B. tallest boys
C. tallest boy
D. the tallest boys
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Li Ming is ___ student in the class.
A. Tall
B. the taller
C. the tallest
D. Tallest
Mike is ___ Tom.
A. healthy than
B. healthier as
C. so healthy as
D. as healthy as
属于压力控制阀的是()。
A. 节流阀
B. 电磁换向阀
C. 溢流阀
D. 单向阀
下列属于流量控制阀的是()
A. 溢流阀
B. 二位五通阀
C. 节流阀
D. 双向阀