混合料中生石灰的使用量一般为（）A、≯3％ B、≯4％ C、≯5％

人体触电致死，是由于肝脏受到严重伤害所致。

在存储体系中，两个重要层次是高速缓存与主存、主存与辅存，这两层次的共同点是 ( )。

A．都为提高存储体系的速度

B．都需要硬件来实现

C．地址变换，失效时要替换

D．都对程序员透明

基底层细胞来源于（）

A.表皮外胚层

B.神经嵴外胚层

C.神经管外胚层

D.中胚层

E.内胚层

In your construction project, the CPI is 1.30 and SPI is 0.85. What could be the potential reason ？（）

A．A critical resource went on sick leave for a long period of time, which had not been anticipated earlie

B．The Cost of raw materials required for construction increased 10%.

C．You had not taken into account inflation rat

D．There was 4 days waiting time in the curing of cement, and work could not be done during that tim

须将粉尘去除后，方可用大量清水冲洗的是（）

A.强碱烧伤（不包括生石灰）

B.电弧烧伤

C.电接触伤

D.生石灰烧伤

E.硫酸烧伤