问题
单项选择题
溢流阀中的先导阀大多采用锥阀结构，因为其（）。
A.密封性好
B.强度好
C.灵敏度高
D.A与B与C
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
溢流阀中的先导阀大多采用锥阀结构，因为其（）。
A.密封性好
B.强度好
C.灵敏度高
D.A与B与C
参考答案：A
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| Ben and Jim are twin 1 . They are nine. They 2 in Shenyang Primary School. They are in 3 class. Every day they 4 school and come back together. Their teacher, Mrs. Green, says to the pupils (小学生) , "Please write a composition (作文) 'My Mother'. Jim is 5 good boy. He writes the composition 6 home. But Ben plays 7 football 8 his friends. The next day Green says to the class, "I read your composition. But two of yours 9 just the same." Ben stands up and says, "Jim and I are twins. We have the same 10 . | |||
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