《建筑施工安全检查标准》规定()米以上的高层建筑,应当设置临时消防水源加压泵和输水管道。
A.24
B.30
C.35
D.40
参考答案:B
The article suggests that when a person _________ under unusual stress he should be especially careful to have a well-balanced diet.
A.is
B.were
C.be
D.was
数字光接收机的灵敏度Pr=100微瓦,则为()dBm。
A.负10
B.10
C.负20
D.负30