密接式折棚风挡的隔声量()。
A.≥22DBA
B.≥23DBA
C.≥24DBA
D.≥25DBA
参考答案:D
下列关于起重吊装作业失稳原因的表述中,不属于吊装系统失稳的是()。
A.超载或机械故障
B.多机吊装的不同步
C.多岗位指挥协调失误
D.桅杆系统缆风绳、地锚失稳
— I'll be able to come to see your performance at 8:30 tomorrow evening.
— I'm sorry, by then my performance ___ and I ____ reporters in the meeting room. [ ]
A. will be ended; will meet
B. is to end; will meet
C. will have ended; will be meeting
D. will end; am going to meet