金枪鱼类隶属于()
A.鯖科
B.鲳科
C.石首鱼科
D.鲈科
参考答案:A
All 5 children of the Blacks, _______ are now working abroad, will come back for their parents’ 50th wedding anniversary.
A.two of whom
B.two of them
C.both of whom
D.both of them
阀控密封铅酸蓄电池安全阀具有()功能
A.调节电池内外压力
B.过滤酸雾
C.阻燃
D.防电池内部污染