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问题 单项选择题

在混凝土用砂量不变的条件下，砂的细度模数越小，说明( )。

A．该混凝土细骨料的总表面积增大，水泥用量提高
B．该混凝土细骨料的总表面积增大，水泥用量减少
C．该混凝土用砂的颗粒级配不良
D．该混凝土用砂的颗粒级配良好

答案

参考答案：A

解析：总表面积增大，水泥用量提高

解答题
5
8
+
7
9
+
3
8

25
18
-
2
5
-
3
5

2
3
+
7
10
+
1
3
+
3
10

5
9
-
5
12
+
4
9

8
9
-(
1
5
-
1
9
)
5
12
+
11
15
-
6
15
+
7
12
．
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单项选择题

35．Applications put computers to pratical business (1) , but below the (2) it’s the heart of an operating system—the kernel that provides the technical wizardry to juggle multiple program, connect to networks and store (3) . A traditional kernal provides all the functions for applications. The kemal (4) memory, I/O devices and parcels out processor time.
The kernel also supports security and fault (5) , which is the ablity to recover automatically when parts of the system fail.

(2)

A．earth

B．bottom

C．table

D．surface
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