下列物质的用途与其化学性质相关的是 [ ]
A.用铝作导线
B.用金刚石切割玻璃
C.用活性炭作净水剂
D.用粮食酿造酒
答案:D
浇筑混凝土时,()柱子的灌注高度不受限制。
A、自由倾落
B、竖向串筒导送
C、溜管导送
D、无论哪种方法
What is the tens digit of positive integer x ?() (1)x divided by 100 has a remainder of 30. (2)x divided by 110 has a remainder of 30.
A.条件(1)充分,但条件(2)不充分.
B.条件(2)充分,但条件(1)不充分.
C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分.
D.条件(1)充分,条件(2)也充分.
E.条件(1)和条件(2)单独都不充分,条件(1)和条件(2)联合起来也不充分.