安全阀应()安装,并应装在锅筒、集箱的最高位置。
A、水平
B、铅直
C、倾斜
D、随意
参考答案:B
预算定额的编制依据有()等。
A.预算定额
B.施工验收规范
C.投资估算指标
D.安全操作规程
E.质量评定标准
My parents asked me _____ letting off fireworks.
[ ]
A. not to be careful with
B. be careful with
C. careful with
D. to be careful with