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问题 单项选择题

水泥类型中，具有早期强度低，后期强度增长较快，干缩性较小特点的水泥是( )。

A．硅酸盐水泥
B．矿渣硅酸盐水泥
C．火山灰质硅酸盐水泥
D．粉煤类硅酸盐水泥

答案

参考答案：D

判断题

正常情况下，焦饼中心温度每季度测量两次。
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单项选择题

Mobile computers-which (71) laptops, notebooks, subnotebooks and handhelds- (72) so ubiquitous in such a short time, no surprise to hear who say: "It will define the leading edge (73) the next five years or so." The most remarkable (74) mobile computers is the amount of data storage and memory packed (75) their tiny boxes. These devices not only handle windows easily but also run storage-hungry programs.

A．included

B．include

C．have included

D．have become

E．had become
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