from his looks, he is a kind man.
A.Being judged
B.Judged
C.Judging
D.Having judged
答案:C
中南半岛的地形特点是( )
A.东南高,西北低
B.北高南低,山河相间,纵列分布
C.以平原为主
D.中部高四周低
关小离心泵的出口阀,离心泵的工作点()。
A.不变
B.改变
C.不能确定
D.不一定改变