普通砖砌筑时灰缝的砂浆应饱满,水平灰缝的砂浆饱满度不得低于()。
A、80%
B、90%
C、95%
D、98%
参考答案:A
把句子的序号写在相应的图片下。
( ) ( ) ( )
1. The picture is above the lamp. The lamp is below the picture.
2. The girl is beside the boy. The boy is beside the girl.
3. Where is Danny? He's in the library. He's reading a book.
在普通级、SPF级和无菌级等三个等级动物间,相同的动物实验具有相同的实验设计准确性。