48.下列閥體中,何者非用以調節流量之用?
(A)球型閥
(B)釋放閥
(C)針閥
(D)蝶型閥
答案:登入後查看
統計: A(80), B(923), C(61), D(99), E(0) #1961169
統計: A(80), B(923), C(61), D(99), E(0) #1961169