单项选择题
采用蒸压灰砂砖和蒸压粉煤灰砖的砌体的房屋,当砌体的抗剪强度仅达到普通黏土砖砌体的()时,房屋的层数应比普通砖房减少一层,总高度应减少3m。
A．50%
B．60%
C．70%
D．80%
采用蒸压灰砂砖和蒸压粉煤灰砖的砌体的房屋,当砌体的抗剪强度仅达到普通黏土砖砌体的()时,房屋的层数应比普通砖房减少一层,总高度应减少3m。
A．50%
B．60%
C．70%
D．80%
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单项选择题
Print two ____________ on A4 paper. It's the file named "Final Contact".
Print two ____________ on A4 paper. It's the file named "Final Contact".
A．file
B．copy
C．copies
D．portions